taxonID	type	description	language	source
E26E879BB8487155FF6DFB3FFB969D1C.taxon	etymology	Etymology: — The epithet “ baiyunensis ” refers to the location where the type specimen was collected, Baiyun Mountain, Guangzhou, Guangdong Province, China. Holotype: — CHINA. Guangdong Province, Guangzhou City, Baiyun Mountain, 23 ° 10 ′ 16 ″ N 113 ° 17 ′ 32 ″ E, elev. 240 m, 16 August 2021, L. H. Qiu, GDGM 93885, GenBank acc. no.: OR 598795 for ITS, OR 598808 for nrLSU. Diagnosis: — This species is distinguished from other Collybiopsis species by its light brown to yellowish brown pileus with reddish orange to reddish brown disc and whitish margin, a cutis pileipellis composed of subparallel, sometimes intertwined hyphae, and clavate to broadly clavate or spheropedunculate cheilocystidia. Description: — Pileus 23 – 50 mm in diam, hemispherical to convex when young, becoming applanate at maturity, sometimes with a curved or raised margin; surface dry, smooth, dull; reddish orange (# A 0522 D) to reddish brown (# 601 F 00) at the disc, light brown (# E 9 C 68 D) to yellowish brown (# B 88951) towards the margin, usually whitish (# FFFDF 8) at the margin. Lamellae adnexed, subdistant, L = 25 – 37, l = 1 – 6, white to light brown in color. Stipe 30 – 85 × 2.4 ‒ 4.1 mm, cylindrical, central, hollow, surface dry, yellowish brown (# B 88951) to reddish brown (# 601 F 00), sometimes light brown (# E 9 C 68 D) at upper half, reddish brown (# 601 F 00) at lower half, base slightly thickened with white mycelium. Smell indistinctive. Taste not obtained. Basidiospores [130 / 5 / 3] (6.2 –) 6.8 – 9.5 (11.3) × (2.9 –) 3.3 – 4.5 (– 4.9) μm, avl × avw = 8.2 × 3.9 µm, Q = (1.84 –) 1.87 – 2.33 (– 2.40), Q m = 2.10 ± 0.14, oblong to subcylindrical, smooth, thin-walled, hyaline in 5 % KOH, non-dextrinoid. Basidia (20.2 –) 20.6 – 27.7 (31.1) × (5.2 –) 5.5 – 8.4 (– 8.6) μm, avl × avw = 23.7 × 7.1 µm, 4 - spored, hyaline, thin-walled, clavate, sometimes constricted or curved. Cheilocystidia (15.6 –) 16.6 – 32.6 (37.7) × (8.3 –) 8.8 – 13.6 (15.6) μm, avl × avw = 22.8 × 10.9 µm, clavate to broadly clavate, spheropedunculate, sometimes with obtuse or slightly acute apex, thin-walled, smooth. Pleurocystidia absent. Trama hyphae cylindrical, subparallel in arrangement, some part inflated, hyaline, thin-walled, smooth, non-dextrinoid, 2.3 – 14.2 µm in diam, avw = 4.7 µm. Pileipellis a cutis, hyphae subparallelly arranged, sometimes intertwined, 3.0 – 7.5 μm wide, avw = 4.8 µm, cylindrical, hyaline, thin-walled, smooth. Stipitipellis a cutis made up of cylindrical, parallel-arranged hyphae, thin-walled, smooth, 2.2 – 10.3 µm in diameter, avw = 5.5 µm. Caulocystidia (17.2) 21.2 – 71.2 (100.6) × (3.3 –) 3.6 – 6.4 (– 7.0) μm, avl × avw = 39.5 × 4.6 µm, abundant, cylindrical, flexuose, thin-walled, hyaline. Clamp connections present in all tissues. Habitat: — Solitary or scattered in leaf litter or on living trees of an evergreen broadleaf forest. Distribution: — Currently known from Guangdong Province, China. Additional specimens examined: — CHINA. Guangdong Province, Guangzhou City, Baiyun Mountain, 16 August 2021, coll: X. X. Huang GDGM 93884; 29 May 2022, coll: Z. J. Lin & Y. S. Liang GDGM 93886; 14 September 2023, coll: X. C. Liu GDGM 93887. Guangdong Province, Zhaoqing City, Dinghushan Biosphere Reserve, 3 May 2017, coll: L. H. Qiu K 17050311; ditto 29 June 2017, coll: L. H. Qiu H 17062908, GDGM 93883.	en	Liu, Xiao-Chun, Lin, Zhi-Jun, Liang, Ying-Shan, Cao, Li-Xiang, Qiu, Li-Hong (2024): Collybiopsis baiyunensis sp. nov. (Omphalotaceae, Agaricales) from Baiyun Mountain, Southern China. Phytotaxa 640 (2): 183-195, DOI: 10.11646/phytotaxa.640.2.7, URL: http://dx.doi.org/10.11646/phytotaxa.640.2.7
