taxonID	type	description	language	source
912787D4FF92FFF8FF3FF85DFCC0FEC2.taxon	etymology	Etymology: “ atroferrugineus ” refers to the reddish-brown pileus color.	en	Ishaq, Muhammad, Khan, Muhammad Binyamin, Lu, Wenhua, Asif, Muhammad, Tarafder, Entaj, Fiaz, Muhammad, Karunarathna, Samantha C., Khalid, Abdul Nasir, Wen, Ting Chi (2025): Morphology and phylogeny reveal Leucocoprinus atroferrugineus (Agaricaceae), a new species from Pakistan. Phytotaxa 711 (2): 117-130, DOI: 10.11646/phytotaxa.711.2.3, URL: https://doi.org/10.11646/phytotaxa.711.2.3
912787D4FF92FFF8FF3FF85DFCC0FEC2.taxon	materials_examined	Holotype: PAKISTAN, Khyber Pakhtunkhwa Province, Buner District, Pir Baba, 1021 m a. s. l., under Pinus roxburghii Sarg in coniferous forest, 12 August 2018, Muhammad Ishaq, LAH 36771. GenBank accession ITS = OQ 746332.	en	Ishaq, Muhammad, Khan, Muhammad Binyamin, Lu, Wenhua, Asif, Muhammad, Tarafder, Entaj, Fiaz, Muhammad, Karunarathna, Samantha C., Khalid, Abdul Nasir, Wen, Ting Chi (2025): Morphology and phylogeny reveal Leucocoprinus atroferrugineus (Agaricaceae), a new species from Pakistan. Phytotaxa 711 (2): 117-130, DOI: 10.11646/phytotaxa.711.2.3, URL: https://doi.org/10.11646/phytotaxa.711.2.3
912787D4FF92FFF8FF3FF85DFCC0FEC2.taxon	diagnosis	Diagnosis: Different from Leucocoprinus pyrrhulus due to dark reddish brown areolate-fibrillose squamules on the pileus, becoming dull reddish brown to reddish brown towards the margin, a hollow stipe with a pale pinkish apex, dark fibrils below the annulus, turning orange, then dark when scratched and presence of annulus, large (size) ellipsoid to amygdaliform basidiospores.	en	Ishaq, Muhammad, Khan, Muhammad Binyamin, Lu, Wenhua, Asif, Muhammad, Tarafder, Entaj, Fiaz, Muhammad, Karunarathna, Samantha C., Khalid, Abdul Nasir, Wen, Ting Chi (2025): Morphology and phylogeny reveal Leucocoprinus atroferrugineus (Agaricaceae), a new species from Pakistan. Phytotaxa 711 (2): 117-130, DOI: 10.11646/phytotaxa.711.2.3, URL: https://doi.org/10.11646/phytotaxa.711.2.3
912787D4FF92FFF8FF3FF85DFCC0FEC2.taxon	description	Description: Basidiomata medium-sized. Pileus 44 − 65 mm diam., ovoid initially, becoming plano-convex with puny umbo upon maturity, radially oriented tufts of fibrillose squamules, dark red-brown (5 YR 3 / 2, 3 / 3, 3 / 4) at umbo, becoming dull red-brown (5 YR 4 / 34,5 / 4) to red-brown (5 YR 4 / 6,4 / 8) toward margin, areolate, on white background, with decurved margin, irregularly fringed, yellow to yellowish dark orange upon bruising. Lamellae white (2.5 R 9 / 2) when young, becoming bright brown (2.5 YR 5 / 6,5 / 8) to pink (2.7 YR 6 / 8) at maturity, free, closed to crowded, ventricose. Stipe 35 − 75 × 3 − 5 mm, gradually widening toward base, 9 mm wide, whitish brown (10 R 8 / 2) from above the middle, dull reddish brown (5 YR 4 / 34, 5 / 4) fibrillose below the middle, white (2.5 R 9 / 2) glossy tomentose base adhering to leaves or woody debris, solid. Annulus unclear, with a fugacious, partial veil present at a young age, disappearing when mature. Context up to 3 mm thick, white, and pliable. Smell fungoid. All parts of the basidiomata turn yellow-orange (7.5 YR 7 / 8,8 / 8) on bruising or handling. Basidiospores [60 / 3 / 1] (5.7 −) 7.3 − 8.2 (− 8.4) × (3.6 −) 3.63 − 4.4 (− 4.5) μm, L × W = 7.7 × 4.1 μm, Q = (1.5 −) 1.7 − 2.1 (− 2.2), Qav = 1.9, oblong-ellipsoid, subcylindrical to amygdaliform, apiculate, hyaline, guttulate, smooth, thick - walled, dextrinoid. Basidia 15 − 17.7 × 6.7 − 8.3 μm, 4 - spored, clavate, thin-walled. Cheilocystidia 33 − 56 × 16 − 22 μm, broadly fusiform to narrowly utriform to utriform, thin-walled. Pleurocystidia absent. Pileipellis a cutis composed of hyphae 5.5 − 9.4 μm in diam, terminal elements 64 − 96 × 9.6 − 22 μm, reddish brown with obtuse ends having no pigments. Clamp connections absent in all tissues. Macro-chemical reactions: Pileus, lamellae, and stipe turning bluish green with 5 % NH 4 OH. Habitat: Saprotrophic, in small groups on the litter of Pinus roxburghii in coniferous forest with nutrient-rich loamy soil.	en	Ishaq, Muhammad, Khan, Muhammad Binyamin, Lu, Wenhua, Asif, Muhammad, Tarafder, Entaj, Fiaz, Muhammad, Karunarathna, Samantha C., Khalid, Abdul Nasir, Wen, Ting Chi (2025): Morphology and phylogeny reveal Leucocoprinus atroferrugineus (Agaricaceae), a new species from Pakistan. Phytotaxa 711 (2): 117-130, DOI: 10.11646/phytotaxa.711.2.3, URL: https://doi.org/10.11646/phytotaxa.711.2.3
912787D4FF92FFF8FF3FF85DFCC0FEC2.taxon	materials_examined	Additional materials examined: Pakistan, Khyber Pakhtunkhwa Province, Buner District, Gokand Valley Kot Village, 1650 m a. s. l., 15 August 2018, Muhammad Ishaq (HUP 11548), GenBank accession ITS = OQ 746333; 25 July 2020 Muhammad Ishaq (HUP 11556), GenBank accession ITS = OQ 746338.	en	Ishaq, Muhammad, Khan, Muhammad Binyamin, Lu, Wenhua, Asif, Muhammad, Tarafder, Entaj, Fiaz, Muhammad, Karunarathna, Samantha C., Khalid, Abdul Nasir, Wen, Ting Chi (2025): Morphology and phylogeny reveal Leucocoprinus atroferrugineus (Agaricaceae), a new species from Pakistan. Phytotaxa 711 (2): 117-130, DOI: 10.11646/phytotaxa.711.2.3, URL: https://doi.org/10.11646/phytotaxa.711.2.3
912787D4FF92FFF8FF3FF85DFCC0FEC2.taxon	discussion	Discussion Phylogenetic analysis, based on the ITS dataset, revealed that the three Pakistani sequences formed a well-supported monophyletic lineage, sister to Lc. pyrrhulus and Lc. flammeotinctoides Vellinga with 66 % ML BS and PP = 0.90 support values (Fig. 1). Leucocoprinus atroferrugineus, is significantly different from Lc. pyrrhulus due to the presence of micro-morphological characteristics, such as its pileus plano-convex with a small umbo, dark-reddish brown at the umbo becoming dull-reddish brown to reddish brown toward the margin, and ellipsoid, sub-cylindrical to amygdaliform basidiospores. The pileus of Lc. atroferrugineus, measuring 44 − 65 mm diam, with dark reddish brown areolate-fibrillose squamules on the disc, becoming dull reddish brown toward the margin, is contrasted with Lc. pyrrhulus. Furthermore, the hollow stipe features a pale pinkish apex, dark fibrils below the annulus, which turn orange and then dark when scratched. The presence of an annulus adds to the significance of our findings (Vellinga 2010). Another taxon, Lc. flammeotinctoides, initially has dark grey scales on the umbo, becoming dark brown to dark red-brown with white-cream to yellow-white lamellae. In contrast, Lc. atroferrugineus has areolate, dark-reddish brown radially oriented tufts of fibrillose squamules, at the umbo becoming dull reddish brown to reddish brown toward the margin with white, glossy lamellae. Furthermore, it has larger cheilocystidia (22 – 53 × 5 – 15 μm) and different shapes, as well as large-sized basidia (18 – 29 × 6.5 – 9.5 μm) (Vellinga 2010).	en	Ishaq, Muhammad, Khan, Muhammad Binyamin, Lu, Wenhua, Asif, Muhammad, Tarafder, Entaj, Fiaz, Muhammad, Karunarathna, Samantha C., Khalid, Abdul Nasir, Wen, Ting Chi (2025): Morphology and phylogeny reveal Leucocoprinus atroferrugineus (Agaricaceae), a new species from Pakistan. Phytotaxa 711 (2): 117-130, DOI: 10.11646/phytotaxa.711.2.3, URL: https://doi.org/10.11646/phytotaxa.711.2.3
