Sinohygrocybe tomentosipes C.Q. Wang, Ming Zhang & T.H. Li

Wang, Chao-Qun, Zhang, Ming, Li, Tai-Hui, Liang, Xi-Shen & Shen, Ya-Heng, 2018, Additions to tribe Chromosereae (Basidiomycota, Hygrophoraceae) from China, including Sinohygrocybe gen. nov. and a first report of Gloioxanthomycesnitidus, MycoKeys 38, pp. 59-76 : 59

Sinohygrocybe tomentosipes C.Q. Wang, Ming Zhang & T.H. Li sp. nov. Figs 3, 4

Diagnosis.

Differs from the other members of the tribe Chromosereae by its larger and more robust basidiomata, concolorous yellow pileus, lamellae and the subsurface of stipe, usually furcate and interveined lamellae and lamellulae, white fibrillose stipe surface, long basidia (up to 80 μm), ratio of basidia to basidiospore length over 5 and even up to 8.

Etymology.

The species epithet tomentosipes refers to the tomentose stipe.

Type.

China. Sichuan Province, Panzhihua City, Yanbian County, Gesala Eco-tourism Area, at 27°16'N, 101°26'E, alt. 3100 m, 24 Aug 2013, Ming Zhang (GDGM43351, holotype).

Description.

Basidiomata small to medium-sized. Pileus 2.5-6 cm diam., convex to applanate, usually slightly depressed in the centre, smooth, dry but subviscid when wet, light yellow to vivid yellow (3A5-8) or to deep yellow (4A5-8), or light orange to dark orange (5A5-8), becoming paler when dry; margin even, straight or upturned and occasionally split when mature. Lamellae up to 7 mm wide, adnate to sinuate or decurrent, distant, 17-22 lamellae per pileus, with 1-3 lamellulae between two complete lamellae, usually furcate, often interveined or anastomosing at lamella base, thick, concolorous with the pileus; lamellar base and lamellulae irregular and occasionally the whole hymenophore irregular; lamellar edge even and concolorous. Context concolorous with lamellae and pileus, unchanged when cut. Stipe 4-6.5 × 0.6-1.2 cm, central or occasionally eccentric, subcylindrical, moderately to densely covered with white tiny adpressed fibres. Odour indistinct.

Basidiospores 8 –10(– 10.5) × (4.5 –)5–7(– 7.5) μm, Q = (1.3 –)1.5– 1.8, Qm = 1.6-1.7, ellipsoid to ellipsoid-oblong, ovoid, not constricted, thin-walled, hyaline, smooth. Basidia 41-80 × 4-10 μm, strongly elongated, narrow clavate, 4-spored, thin-walled; sterigmata up to 10 μm long; ratio of basidia to basidiospore length over 5 and up to 8. Hymenophoral trama subregular, yellow, made up of thin-walled hyphae 3-15 µm wide and usually less than 100 μm long and some conducting elements. Pileipellis a cutis, made up of repent hyphae 3-9 µm wide with the terminal elements 30-80 µm long. Stipitipellis a cutis, with thin-walled hyphae (5-7 μm wide). Clamp-connections present in all tissues.

Habitat and known distribution.

Gregarious, caespitose, or scattered in broad-leaf forest in subtropical temperate transition zone, so far known only from Sichuan and Hunan Provinces in China.

Additional specimens examined.

CHINA, Sichuan Province, Panzhihua City, Yanbian County, Gesala Eco-Tourism Area, at 27°16'N, 101°26'E, alt. 3100 m, 24 Aug 2013, Ming Zhang (GDGM43347), Chao-Qun Wang (GDGM43352); Hunan Province, Zhuzhou City, Yanling County, Taoyuandong National Nature Reserve, at 26°19'N, 114°00'E, alt. 1534 m, 23 Nov 2013, Chao-Qun Wang (GDGM50075 and GDGM50149).