taxonID	type	description	language	source
03BC87D134401E5AFC905A15FB25F8C2.taxon	materials_examined	TYPE: Albomagister subaustralis (A. H. Sm. & Hesler) Sánchez-García, Birkebak & Matheny.	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134401E5AFC905A15FB25F8C2.taxon	description	DESCRIPTION: Habit tricholomatoid, mycenoid, or inocyboid. Lamellae sinuate to adnexed, white, cream, yellowish, and at times drying ocher-yellow. Basidiospores smooth, thin-walled (less often with thickened wall), and inamyloid (less often weakly amyloid or dextrinoid). Pleurocystidia present and conspicuous in most species, thin-walled or with slightly thickened walls, hyaline. Cheilocystidia similar to pleurocystidia and present in all species. Pileipellis a cutis, often with ascending interwoven cylindric elements. Lamellar trama parallel. Clamp connections present, common, and easy to observe. On soil. North American taxa occur in forests under ectomycorrhizal trees, but European taxa occur among non-ectomycorrhizal plants such as Buxus. Occurring in North America, Europe, and New Zealand.	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134401E5AFC905A15FB25F8C2.taxon	discussion	TAXONOMIC NOTES: The genus is emended here to include at least one new species without pleurocystidia and other species with a mycenoid to inocyboid habit as first noted by Corriol and Jargeat (2018). Moreau et al. (2015) and Moyne and Moingeon (2018) reported faintly amyloid basidiospores in A. alesandrii, and Corriol and Jargeat (2018) reported a small percentage of spores with a dextrinoid reaction in A. virgineus. In some species a small proportion of spores may be larger and display a thickened wall (Moreau et al. 2015; Corriol and Jargeat 2018; Moyne and Moingeon 2018). Stable isotope values of carbon and nitrogen support the ectomycorrhizal status of A. subaustralis, the type of the genus (Sánchez-García and Matheny 2017), but occurrence of the two European species with non-ectomycorrhizal plants, viz. Buxus sempervirens, suggests these are not ectomycorrhizal.	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134431E5CFCAA5B74FA18FA3E.taxon	description	MYCOBANK: MB 851399.	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134431E5CFCAA5B74FA18FA3E.taxon	materials_examined	TYPE: USA, Tennessee, Sevier County, Great Smoky Mountains National Park, Elmont, Jakes Creek Trail (35.6764 - 83.3971), in humus in acidic cove hardwood forest under various hardwoods and Tsuga canadensis, 4 August 2009, J. Lennie ECV 4038 (holotype designated here, TENN-F- 064609).	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134431E5CFCAA5B74FA18FA3E.taxon	diagnosis	DIAGNOSIS: Differs from the white species of Albomagister by the gray squarrose to appressed-scaly pileus and stipe.	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134431E5CFCAA5B74FA18FA3E.taxon	description	Habit tricholomatoid. Pileus 25 – 50 mm wide, campanulate to plano-convex and at times with a low broad umbo, more flattened with age; margin decurved, occasionally torn or undulating; surface dry, initially with a whitish ground color, becoming gray and completely covered with dense small dark gray to blackish squamules, these squarrulose when young and more like fibrillose-scales in more-or-less concentric bands in age, not hygrophanous; context pale gray with dark gray areas, odor, and taste indistinct, absent, or mild. Lamellae sinuate to adnate, close to crowded with ca. 55 – 60 L and 1 – 3 tiers of lamellulae, thick, narrow (3 – 5 mm), white to pale gray or gray with white edges that darken to gray, edges sometimes eroded. Stipe 35 – 70 × 4 – 7 mm, equal to slightly narrowed or slightly enlarged at the base; surface dry, veil absent, fibrillose at the apex but mostly with gray scaber-like squamules or with the squamules covering the entire length on a whitish or paler background, squamules smaller towards the base, becoming lacerate-scaly with age; context pale gray, becoming paler towards the nearly white base; hollow. Basidiospores 6 – 7.1 – 8 × (4) 4.5 – 5.6 – 6.7 µm, Q 1.10 – 1.28 – 1.57 (n = 65 / 4), smooth, elliptic to broadly so or subglobose, with a guttule, hyaline, inamyloid, with a distinct apiculus, white in deposit. Basidia 25 – 37 × 7 – 9.5 µm, 4 - spored, clavate to subcylindric, hyaline. Pleurocystidia 38 – 74 × 11 – 20 µm, obovate, sphaeropedunculate, broadly clavate, or fusiform-rostrate, with a long pedicel, with a rounded or mucronate apex, with thin or slightly thickened wall, brown pigmented. Cheilocystidia forming a sterile lamellar edge, 24 – 80 × 7 – 15 µm, often narrowly lageniform to abruptly fusiform, very long pedicellate, walls slightly thickened and brown pigmented. Pileipellis an irregular trichoderm with chained elements, these narrowed gradually, hyphae incrusted; terminal cells 45 – 115 × 9 – 18 µm, utriform to somewhat conical, less often narrowly lageniform, base generally broad, apices often with a moniliform excrescence, at times rostrate, brownish pigmented. Stipitipellis similar to pileipellis. Clamp connections present, large, and conspicuous.	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134431E5CFCAA5B74FA18FA3E.taxon	discussion	TAXONOMIC NOTES: Albomagister griseosquamosus was previously reported as “ undet gray scaly ” in Sánchez-García et al. (2014, 2017). This species resembles Tricholoma squarrulosum Bres. and T. atrosquamosum Sacc., but in its outward appearance A. griseosquamosus differs from these by the more elongated non-bulbous stipe and non-farinaceous odor and taste. Microscopically, A. griseosquamosus differs readily from these by the presence of distinct pleuro- and cheilocystidia and the large conspicuous clamp connections found throughout the all tissues. The basidiospores of the Quebec collections (6 – 6.5 – 7.5 × 4 – 4.8 – 5) µm, Q 1.09 – 1.30 – 1.63 are somewhat smaller than the type and ECV 5690 from Tennessee. Although not analyzed here, an rpb 1 sequence was also produced from the type of A. griseosquamosus —— KU 139073 (Sánchez-García and Matheny 2017).	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134431E5CFCAA5B74FA18FA3E.taxon	etymology	ETYMOLOGY: griseosquamosus (Latin), gray scaly, in reference to the gray scales on the pileus and stipe	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134431E5CFCAA5B74FA18FA3E.taxon	distribution	DISTRIBUTION AND ECOLOGY: Albomagister griseosquamosus apparently is widely distributed in eastern North America, having been found in both Quebec and Tennessee, although there is a broad sampling gap between these regions. It occurs on acidic soils (where known) at relatively low elevations (<600 m), in mixed and cove hardwood forests containing some mixture of the following ectomycorrhizal trees: Abies, Fagus, Betula, Tsuga and / or Tilia. Basidiomes have been observed August to September.	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134431E5CFCAA5B74FA18FA3E.taxon	materials_examined	OTHER SPECIMENS EXAMINED: Canada, Quebec, Saint-Stanislas, Parc de la rivière Batiscan, secteur Murphy, trial Le Buis (46.5891 - 72.4125), solitary on ground in leaf litter in mixed forest under Abies balsamea, Betula alleghaniensis, 7 September 2020, R. Lebeuf & A. Paul HRL 3282 (DAOM 984972); Saint-Alexis-des-Monts, chemin Yvon-Plante (46.5099 - 73.1955), gregarious on soil in northern hardwood forest under Fagus grandifolia, Abies balsamea, Acer, 16 Aug. 2023, R. Lebeuf & A. Paul HRL 4268 (R. L. pers. fung., iNat 178773906). USA, Tennessee, Sevier Co., Great Smoky Mountains National Park, Greenbrier, Ramsey Cascades Trail (35.7028 - 83.3575), acidic cove hardwood forest including Tsuga canadensis, Betula alleghaniensis, Tilia americana, Quercus, 5 September 2013, E. C. Vellinga ECV 5690 (TENN-F- 068763).	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134451E5DFCAA59C3FC48F9D0.taxon	description	MYCOBANK: MB 851400.	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134451E5DFCAA59C3FC48F9D0.taxon	materials_examined	TYPE: USA, Tennessee, Cocke County, Great Smoky Mountains National Park, Cosby, Maddron Bald Trail (35.7652 - 83.2680), on soil and needle leaf litter in acidic cove hardwood forest under Tsuga canadensis, 10 October 2010, E. C. Vellinga ECV 4202 (holotype designated here, TENN-F- 065323).	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134451E5DFCAA59C3FC48F9D0.taxon	diagnosis	DIAGNOSIS: Basidiomes with an inocyboid habit, white with underlying grayish drab ground color, in age with straw yellow to amber-yellow discolorations on the pileus and stipe, on acidic soil in a cove hardwood forest under Tsuga canadensis. Phylogenetically distinct and sister to the clade including A. subaustralis and A. luteifolius.	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134451E5DFCAA59C3FC48F9D0.taxon	description	Habit small, inocyboid. Pileus 10 – 23 mm wide, obtusely conical, expanding with age, slightly umbonate and subcampanulate, margin decurved; surface dry but with some adhering soil particles, dull, innately white silky fibrillose, fibrils thinning at the center and revealing a grayish drab ground color, thicker and whitish or indistinctly straw yellow or grayish drab in places towards the margin; conext thick, odor, and taste not remarkable. Lamellae sinuate, moderately close, thick, broad, whitish to pale grayish white, becoming buff or tinged cream with age, edges white and indistinctly fimbriate. Stipe 15 – 25 × 2 – 5 mm, terete, equal; dry, fibrillose white, in age revealing amber yellow discolored areas, base covered with soil and needle litter of Tsuga canadensis. Basidiospores 5 – 6.0 – 7 × (3.5 –) 4 – 4.3 – 5 µm, Q 1.16 – 1.40 – 1.68 (n = 21 / 1), broadly elliptic to subovate, smooth, thin-walled, with a distinct apiculus, inamyloid and nondextrinoid. Basidia 29 – 40 × 6 – 7 µm, 4 - spored, slenderly clavate, hyaline, thin-walled. Pleurocystidia 48 – 60 (– 86) × 14 – 16 µm, ventricose with a long slender pedicel, smooth, walls slightly thickened (ca. 1.0 µm thick), hyaline. Cheilocystidia 22 – 55 × 6 – 17 µm, many shorter than the pleurocystidia and thin-walled, also subfusiform, utriform, or clavate, some ventricose and long-pedicellate like the pleurocystidia, frequent on the lamellar edges but mixed with fertile basidia. Pileipellis a cutis, hyphae smooth, cylindric, mostly 5 – 12 µm wide. Stipitipellis without caulocystidia, surface hyphae cylindric, mostly 4 – 6 µm wide, smooth, thin-walled. Clamp connections abundant in all tissues.	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134451E5DFCAA59C3FC48F9D0.taxon	discussion	TAXONOMIC NOTES: Albomagister leucoloma is described from a single collection made on acidic soil in a cove hardwood forest under Tsuga canadensis and various hardwoods in the Great Smoky Mountains. The species is phylogenetically distinct from, but most closely related to, the clade including A. subaustralis and A. luteifolius; indeed, all three species produce pleurocystidia. Based on the single gathering, we observed the pileus of A. leucoloma to reveal a grayish drab tone at the center, apparently as the thin white fibrillose vesture wears away. In age some yellow to amber-yellow discolorations were also noted on the pileus and stipe surfaces, but the dried specimens were off-white. The species may be distinguished from others by the grayish drab underlying tone to the pileus and somewhat larger spores, and, of course, with phylogenetic evidence. We have only recorded the species once despite years of collecting in the Great Smoky Mountains National Park, so it is comparatively rare or possibly overlooked or misidentified. Albomagister leucoloma equates to Albomagister sp. 3 in Sánchez-García et al. (2014, 2017). Although not analyzed here, an rpb 1 sequence was also produced from the type of A. leucoloma —— KU 139019 (Sánchez-García and Matheny 2017).	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134451E5DFCAA59C3FC48F9D0.taxon	etymology	ETYMOLOGY: leucoloma (Greek), white fringe, in reference to the overall whitish basidiome coloration	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134451E5DFCAA59C3FC48F9D0.taxon	distribution	DISTRIBUTION AND ECOLOGY: Albomagister leucoloma is known only from the type locality in east Tennessee in the Great Smoky Mountains. It occurred singly on acidic soil at relatively low elevations (<600 m) in a cove hardwood forest mixed with Tsuga canadensis. Basidiomes were recorded in October.	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134441E5EFC905A6AFBA8FC85.taxon	description	MYCOBANK: MB 851401.	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134441E5EFC905A6AFBA8FC85.taxon	materials_examined	TYPE: Canada, Quebec, Saint-Thuribe, Rang Saint-Léon (42.3327 - 72.9571), on soil in mixed forest including Fagus grandifolia with few Abies balsamea, 16 September 2018, R. Lebeuf HRL 2773 (holotype designated here DAOM 984969, isotype TENN-F- 074689).	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134441E5EFC905A6AFBA8FC85.taxon	diagnosis	DIAGNOSIS: Differs from other species of Albomagister by the habit similar to Inocybe geophylla, yellowing lamellae, and distinct phylogenetic position sister to A. subaustralis.	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134441E5EFC905A6AFBA8FC85.taxon	description	Habit inocyboid resembling Inocybe geophylla in outward appearance. Pileus 7 – 30 mm wide, campanulate, margin inflexed then deflexed; surface dry, with appressed radial fibrils, at times with watery drops near the margin; white, pale yellow over the center; context yellowish white to pale yellow (3 A 2, 3 A 3), thin; odor none, taste bitter. Lamellae adnexed to sinuate, distant to moderately so, 1.5 – 5 mm deep; white at first, becoming yellowish white (4 A 2) and darker yellow with age, light yellow (near 4 A 5) after drying, not waxy. Stipe 20 – 60 × 1 – 6 mm, equal, often curved; surface dry, veil not observed, pruinose to flocculose at the apex, fibrillosestriate below, when young with watery drops near the apex; white; context yellowish white to pale yellow. KOH negative on surfaces of the pileus and stipe and on the stipe context. Basidiospores 4.5 – 5.0 – 6 × (3 –) 3.5 – 3.7 – 4 (– 4.5) µm, Q 1.13 – 1.37 – 1.57 (– 1.71) (n = 90 / 3), elliptic to broadly elliptic (more broadly so from less mature basidiomes), smooth, inamyloid, white in deposit. Basidia 21 – 27 × 6 – 7 µm, 4 - spored, clavate. Pleurocystidia 38 – 66 × 8 – 14 µm, frequent, fusiform to subutriform or subcylindric or oblong, often shortpedicellate, thin-walled, hyaline. Cheilocystidia 48 – 75 × 8 – 14 µm, similar to pleurocystidia but at times long-pedicellate (pedicels up to 20 µm long). Pileipellis a cutis composed of cylindric hyphae 2 – 7 µm wide; tramal hyphae inflated, 5 – 20 µm wide. Stipitipellis without caulocystidia; hyphae cylindric, 3 – 9 µm wide. Clamp connections abundant in all tissues.	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134441E5EFC905A6AFBA8FC85.taxon	discussion	TAXONOMIC NOTES: Albomagister luteifolius and A. subaustralis are difficult to distinguish based on morphology only. Indeed, both are sister taxa, but A. luteifolius, based on the proportion of samples sequenced, appears to be the less frequently encountered of the two species. Based on available data, A. luteifolius is best distinguished from A. subaustralis by the smaller Inocybe geophylla- like habit. Comparison of dried materials of both species suggests neither can be reliably distinguished by the yellowish to ocher-yellow color of the dried lamellae. Albomagister luteifolius does not appear to be common but has been overlooked and misidentified as A. subaustralis in the past (see AHS 14872 cited under H. subaustralis in Hesler and Smith 1963). The species occurs in mixed hardwood forests and mixed forests including conifers and has a wide geographic range having been confirmed by molecular data from Quebec and the southern Appalachians during August and September. Albomagister luteifolius equates to Albomagister sp. 2 in Sánchez-García et al. (2014, 2017).	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134441E5EFC905A6AFBA8FC85.taxon	etymology	ETYMOLOGY: luteifolius (Latin), yellow gills, in reference to the yellowish-tinged lamellae.	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134441E5EFC905A6AFBA8FC85.taxon	distribution	DISTRIBUTION AND ECOLOGY: Albomagister luteifolius is widely distributed across eastern North America, having been found in Quebec, North Carolina, and Tennessee, but a broad sampling gap occurs between those regions. It occurs singly to scattered or gregarious on acidic or possibly more nutrient enriched soils at relatively low- to mid-elevations (<1200 m) in leaf litter in mixed hardwood- Tsuga canadensis dominated forests, cove hardwood forests under Quercus, northern hardwood forests, and in mixed forests containing Fagus, Abies, and / or Betula. Basidiomes were recorded in August and September.	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134441E5EFC905A6AFBA8FC85.taxon	materials_examined	OTHER SPECIMENS EXAMINED: Canada, Quebec, Saint-Thuribe, Rang Saint-Léon (42.3327 - 72.0571), in beech-maple forest under Fagus grandifolia, 11 September 2020, R. Lebeuf & A. Paul HRL 3286 (DAOM 984970); ibid., under Fagus grandifolia, Betula alleghaniensis, 11 September 2020, R. Lebeuf & A. Paul HRL 3287 (DAOM 984971). USA, North Carolina, McDowell Co., Marion, Armstrong Creek (35.6830 - 82.0058), in mixed hardwood forest with Tsuga canadensis, 21 September 2012, M. Sánchez-García MSG 136 (TENN-F- 068775); McDowell Co., Little Switzerland, Blue Ridge Parkway, Swofford Road near Table Rock Overlook (36.5186 - 80.9358), in mixed hardwood forest along a gravel road, 21 September 2012, B. P. Looney MSG 137 (TENN-F- 068776); McDowell Co., near Marion, Pisgah National Forest, Victor Road (35.803 - 82.162), in a swamp forest bog complex under Betula, Tsuga, Quercus, 22 September 2023, S. R. Warwick & P. B. Matheny PBM 4797 (TENN-F- 078516); Mitchell Co., Roses Creek, on acidic soil in cove hardwood forest, 22 September 2023, C. R. Noffsinger CRN 92223 A (TENN-F- 078620). Tennessee, Blount Co., Great Smoky Mountains National Park, Cades Cove (35.5942 - 83.842), in rich cove hardwood forest with Quercus, 17 Aug. 1939, A. H. Smith AHS 14872 (MICH 58090 as “ Hygrophorus subaustralis ”).	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134471E5FFCAA5FB9FF00FA51.taxon	description	MYCOBANK: MB 851402.	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134471E5FFCAA5FB9FF00FA51.taxon	materials_examined	TYPE: USA, Tennessee, Sevier County, Great Smoky Mountains National Park, Cherokee Orchard, last turn-off before Rainbow Falls (36.1328 - 83.8144), on acidic soil in cove hardwood forest near Tsuga canadensis, Pinus, Quercus, 31 August 2013, E. C. Vellinga MSG 144 (holotype designated here, TENN-F- 071074).	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134471E5FFCAA5FB9FF00FA51.taxon	diagnosis	DIAGNOSIS: Differs from other Albomagister by the absence of pleurocystidia, small basidiome size, and occurrence in eastern North America. Differs from A. virgineus by the slightly smaller spores, none of which are dextrinoid, and occurrence in acidic cove hardwood forests of eastern North America.	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134471E5FFCAA5FB9FF00FA51.taxon	description	Habit small, mycenoid to inocyboid. Pileus up to 15 mm wide, convex, whitish, smooth, dry. Lamellae adnexed, close, whitish. Stipe 20 × 2 mm, slightly enlarged at the base; surface dry, fibrillose, off-white. Basidiospores 5 – 5.3 – 6 (– 6.5) × 4 – 4.7 – 5.5 µm, Q 1.08 – 1.16 – 1.28 (n = 40 / 1), subglobose to broadly elliptic, with a guttule, hyaline, inamyloid and nondextrinoid, with a distinct apiculus, white in deposit. Basidia 24 – 29 × 6 – 8 µm, 4 - spored, narrowly clavate to subcylindric, hyaline. Pleurocystidia absent. Cheilocystidia 24 – 52 × 5 – 7.5 µm, cylindric to narrowly utriform, at times narrowly clavate-flexuous, very long pedicellate, forming a sterile lamellar edge. Pileipellis hyphae slightly interwoven with some tips projecting upwards; terminal hyphae 55 – 98 × 6 – 9 µm, these narrowly cylindric to somewhat clavate-fusiform, hyaline, apices generally obtuse (rarely rostrate). Stipitipellis with scattered terminal cells 15 – 39 × 6 – 8 µm, these cylindric to clavate, smooth, thin-walled, hyaline. Clamp connections present in all tissues.	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134471E5FFCAA5FB9FF00FA51.taxon	discussion	TAXONOMIC NOTES: Albomagister parviniveus is the same as “ undet small white ” in Sánchez-García et al. (2014, 2017). The species is distinguished from other American Albomagister most notably by the very small basidiomes and absence of pleurocystidia. We have only observed this species twice over a span of 15 years, but on both occasions at Cherokee Orchard in the Great Smoky Mountains National Park. The species is sister to the European A. virgineus, which also lacks pleurocystidia; however, it differs from A. parviniveus by the slightly larger spores with occasional dextrinoid walls and occurrence in a boxwood (Buxus) habitat in France.	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134471E5FFCAA5FB9FF00FA51.taxon	etymology	ETYMOLOGY: parviniveus (Latin), small and white, in reference to the small white basidiomes.	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134471E5FFCAA5FB9FF00FA51.taxon	distribution	DISTRIBUTION AND ECOLOGY: Albomagister parviniveus is known only from the type locality in the Great Smoky Mountains National Park where it has been collected in two different years. This species occurs singly on acidic soils in cove hardwood forests near Tsuga, Quercus, Betula, and Pinus. Basidiomes were observed in August.	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134471E5FFCAA5FB9FF00FA51.taxon	materials_examined	ADDITIONAL SPECIMENS EXAMINED: USA, Tennessee, Sevier County, Great Smoky Mountains National Park, Cherokee Orchard Loop Road (35.6758, − 83.4861), on ground in cove hardwood forest near Tsuga canadensis, Quercus, Betula, Pinus, 6 August 2009, M. B. Pilkington MBP 6. VIII. 09 (TENN-F- 064359).	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134461E50FF8B5983FEE4F9B0.taxon	description	Habit tricholomatoid, resembling small forms of Tricholoma columbetta. Pileus 27 – 44 mm wide, bluntly conical with an inflexed margin when young, expanding to plano-convex or applanate with age, with a broad umbo; surface dull, matte, felted and slightly radially fibrillose towards the margin; white, at times yellowish at the center, not hygrophanous; context white and dull, odor mild or somewhat unpleasant, not farinaceous. Lamellae sinuate, close with several tiers of lamellulae, slightly yellowish white, broad (up to 7 mm deep), edges concolorous and entire in appearance. Stipe 45 – 55 × 5 – 10 mm, equal, at times somewhat flexuous, fragile; surface dry but on occasion with beads of moisture at the apex, tomentose on the lower part, veil absent; white; stuffed to hollow. Basidiospores 4 – 4.6 – 5 (5.3) × 3.5 – 3.8 – 4 (4.3) µm, Q 1.10 – 1.25 – 1.40 (n = 61 / 3), broadly elliptic to subglobose, at times with a guttule, hyaline, thin-walled, inamyloid and nondextrinoid, with a distinct apiculus, white in deposit. Basidia 20 – 28 × 5 – 6 µm, 4 - spored, narrowly clavate to cylindric, hyaline, thin-walled. Pleurocystidia 26 – 56 × 8 – 15 µm, narrowly utriform or fusiform to utriform, rarely oblong to obovate, with rounded or obtuse apices, long pedicellate, thin-walled, hyaline; scattered, somewhat more frequent towards the fertile lamellar edges. Cheilocystidia similar to pleurocystidia, at times slenderly clavate, scattered and mixed with fertile basidia. Pileipellis a cutis giving rise to upright and constricted to flexuous cylindric hyphae, 3 – 9 µm wide, thin-walled, hyaline. Stipitipellis without caulocystidia, hyphae of stipe surface 3 – 5 µm wide, hyphae appressed or somewhat recurved, smooth, thin-walled, hyaline. Clamp connections present in all tissues.	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134461E50FF8B5983FEE4F9B0.taxon	discussion	TAXONOMIC NOTES: Albomagister subaustralis is the most commonly collected species of Albomagister in the southern Appalachians. It also produces the largest basidiomes among the white-colored species. Albomagister luteifolius is similar but is characterized by the smaller Inocybe geophylla- like basidiomes. Albomagister leucoloma differs from A. subaustralis by the pileus with grayish drab tints and unique phylogenetic position.	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134461E50FF8B5983FEE4F9B0.taxon	distribution	DISTRIBUTION AND ECOLOGY: Albomagister subaustralis is known only from the southern Appalachians (Georgia, North Carolina, South Carolina, Tennessee) in rich and poor (acidic) cove hardwood forests (<1000 m elev) mixed with hemlock and / or pine and also in oak-hickory-beech forests on karst topography. Potential ectomycorrhizal trees include Tsuga, Betula, Carpinus, Carya, Fagus, Quercus, Pinus, and Tilia. Reports from outside the southern Appalachians have not been confirmed with molecular annotations. Most basidiomes were observed from August to October.	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
03BC87D134461E50FF8B5983FEE4F9B0.taxon	materials_examined	ADDITIONAL SPECIMENS EXAMINED: USA, North Carolina, Swain County, Great Smoky Mountains National Park (GSMNP), Indian Creek, 23 August 1942, L. R. Hesler & A. J. Sharp LRH 14423 (TENN-F- 014423); ibid., 12 September 1947, L. R. Hesler LRH 17951 (TENN-F- 017951); ibid., L. R. Hesler & A. J. Sharp LRH 18628 (TENN-F- 018628); ibid., 14 August 1952, L. R. Hesler LRH 020463 (TENN-F- 020463); Martins Gap, GSMNP, beside the trail, 2 September 1938, A. H. Smith AHS 10844 (holotype, MICH 10951); South Carolina, Oconee County, Oconee State Park, Mountain Rest, 22 September 2013, J. M. Birkebak JMB 092213 - 01 (TENN-F- 070997); Tennessee, Blount County, GSMNP, Cades Cove, 25 September 1957, L. R. Hesler LRH 22663 (TENN-F- 022663); ibid., 26 August 1958, L. R. Hesler LRH 023195 (TENN-F- 023195); ibid., campground area of Cades Cove, 6 August 1959, L. R. Hesler LRH 23221 (TENN-F- 023221); ibid., 26 September 1973, L. R. Hesler LRH 39069 (TENN-F- 039069); Cocke County, GSMNP, Maddron Bald Trail, 4 August 2012, S. A. Trudell SAT- 12 – 217 - 02 (TENN-F- 067343); Monroe County, Tellico Plains, Bald River Falls, Cherokee National Forest, 1 October 2011, W. Burnette WBU 11 (TENN-F- 066902); Sevier County, GSMNP, Elkmont area, Jakes Creek Trail, 4 August 2009, M. G. Wood MGW 676 (TENN-F- 064620); ibid., E. C. Vellinga ECV 4049 (TENN-F- 064621); Sevier County, GSMNP, Greenbrier area at intersection of Greenbrier Road and Ramsey Prong Road, Cemetery Trail, 2 September 2013, M. G. Wood MGW 1296 (TENN-F- 068710).	en	Matheny, P. Brandon, Lebeuf, Renée, Sánchez-García, Marisol, Graddy, Mary G., Trudell, Steven A., Wood, Michal G., Vellinga, Else C. (2024): Four new species of Albomagister (Agaricales) from eastern North America. Botany 102 (9): 355-365, DOI: 10.1139/cjb-2024-0058, URL: https://doi.org/10.1139/cjb-2024-0058
