Laccaria mangshanensis Y. D. Xu & Z. M. He, 2025

Xu, You-Di, Zhang, Ping, Chen, Zuo-Hong & He, Zheng-Mi, 2025, Three new species and two new records of the genus Laccaria (Agaricales, Basidiomycota) from subtropical China based on morphological and multi-locus phylogenetic evidence, MycoKeys 123, pp. 147-170 : 147-170

publication ID	https://doi.org/10.3897/mycokeys.123.156526
DOI	https://doi.org/10.5281/zenodo.17343623
persistent identifier	https://treatment.plazi.org/id/A583755F-1E1D-5D26-B8FB-B2779C6CF47F
treatment provided by	MycoKeys by Pensoft
scientific name	Laccaria mangshanensis Y. D. Xu & Z. M. He
status	sp. nov.

Treatment

Laccaria mangshanensis Y. D. Xu & Z. M. He sp. nov.

Figs 2 d – f View Figure 2 , 4 View Figure 4 , 6 c, d View Figure 6

Etymology.

‘ mangshanensis ’ referring to the locality of the holotype.

Diagnosis.

Laccaria mangshanensis has a pale rosy, hemispherical, radially translucent-striate pileus, pinkish adnate lamellae, a reddish equal stipe, globose to subglobose echinulate basidiospores, and cheilocystidia.

Type.

China • Hunan Province: Yizhang County, Mangshan National Nature Reserve , at 24.866667°N, 112.721944°E, alt. 1200 m, 28 July 2016, P. Zhang 2350 ( MHHNU 8850 , holotype) GoogleMaps .

Description.

Basidiomata small. Pileus 10–30 mm in diam, convex to hemispherical, centrally depressed, surface tomentose, dry, not hygrophanous, reddish-brown (7 A 5) to rosy (7 A 6) when young, then fading to pink-beige (7 A 2); margin strongly striate, rugulose-striate or rugulose-sulcate, involute to inflexed. Lamellae adnate, distant, pinkish (7 A 2) to white (1 A 1), narrow (about 2 mm high), entire, ventricose. Stipe 20–70 × 2–5 mm, central, equal, hollow, obviously flexible, reddish (7 B 5) to dull red (7 C 6), surface with distinct whitish fibrillose coating, base with white (1 A 1) tomentum. Context thin, whitish (2 A 1).

Basidiospores [100 / 4 / 2] (6.5) 7–8.5 (10) × (6) 6.5–8.5 (9) μm, Q = (0.86) 0.93–1.18 (1.31), Qm = 1.05 ± 0.08, mostly globose to subglobose, thin-walled, inamyloid, cyanophilous, hyaline, echinulate, spines (0.5) 1–1.2 (1.5) μm long, 0.3–0.8 (1) in width, subdistant; hilar appendix 0.8–1.5 μm long, subtruncate. Basidia 38–47 × 10–13 μm, 4 - spored, clavate, sharply narrowed, thin-walled, hyaline; sterigmata up to 9 μm long. Pleurocystidia lacking. Cheilocystidia 25–55 × 3–5 μm, filamentous to narrowly clavate, flexuose, thin-walled, hyphae, abundant. Lamellar trama regular to subregular; hyphae cylindrical, hyaline, thin- walled, 3–8 μm wide. Pileipellis a cutis, composed of thin-walled, interwoven, cylindrical hyphae 4–10 μm wide, with exserted ends, hyphae. Stipitipellis a cutis, composed of appressed, parallel, thin- to slightly thick-walled (ca. 0.5 μm) hyphae. Clamp connections present in all parts of basidiomata.

Ecology.

Single, in clusters or in groups, on soil, under the trees of Fagaceae , in subtropical montane coniferous and broadleaved mixed forest, summer (Jul.).

Distribution.

Known from Central China.

Additional specimen examined.

China • Hunan Province: Yizhang County, Mangshan National Nature Reserve , at 24.869722°N, 112.721944°E, alt. 1200 m, 29 July 2016, P. Zhang 2356 ( MHHNU 8856 ) GoogleMaps .

Notes.

Laccaria fengkaiensis F. Liand L. mangshanensis share pale red to pastel red basidiomata, but the former can be distinguished from the latter by the larger pileus ( 50–90 mm pileus width vs. 10–30 mm in L. mangshanensis ), smaller basidiospores (5–6 × 5–6 μm vs. 7–8.5 × 6.5–8.5 μm in L. mangshanensis ), and the presence of pileocystidia ( Li 2020). However, the phylogenetic analysis (Fig. 1 View Figure 1 ) suggests that L. mangshanensis represents a well-supported clade with strong support (Species 41, 94 % BP, 0.94 PP), and is clearly separated from L. fengkaiensis (Species 65).