Trechispora xantha C.L. Zhao, 2021

Zong, Tong-Kai, Liu, Chao-Mao, Wu, Jian-Rong & Zhao, Chang-Lin, 2021, Trechispora daweishanensis and T. xantha spp. nov. (Hydnodontaceae, Trechisporales) found in Yunnan Province of China, Phytotaxa 479 (2), pp. 147-159 : 155-156

Trechispora xantha C.L. Zhao , sp. nov. Figs. 5 , 6

MycoBank no.: MB 838160

Holotype:— CHINA. Yunnan Province, Yuxi, Xinping County, Mopanshan National Forestry Park , E 101°20′30′′, N 22°02′20′′, alt. 2007 m,

on the trunk of Albizia julibrissin , 20 August 2017, CLZhao 2632 ( SWFC!), GenBank No. (ITS MW 302339 ; nLSU MW 293868 ). Etymology:— xantha (Lat.) : refers to the buff colour of the hymenial surface.

Description:— Basidiomata annual, resupinate, without odor or taste when fresh, becoming hard corky up on drying, up to 17 cm long, 3 cm wide, 20–60 µm thick. Hymenial surface smooth, cracking, slightly buff (13:4 A 4) when fresh, becoming darker yellowish (22:4 A 4) upon drying. Subiculum very thin, pale buff (13:4 A 4). Margin narrow, pale buff (13:4 A 4).

Hyphal system monomitic; generative hyphae with clamp connections, IKI–, CB –; tissues unchanged in KOH.

Subiculum composed of colorless, thin-walled, frequently branched, long generative hyphae, 2–3.5 μm in diam., ampullate hyphae frequently present.

Subhymenial composed of colorless, thin-walled, rarely branched, short generative hyphae, 1.5–3.5 μm in diam.; cystidia and cystidoles absent; basidia subcylindrical to subclavate, 14.5–23 × 4.5–7.5 µm, four-spored and with a basal clamp connection; basidioles dominant, in shape similar to basidia, but slightly smaller.

Basidiospores ellipsoid, colorless, thin-walled, smooth, with oil drops, IKI–, CB –, (4–)4.3–5.7(–6) × (3–)3.2–4(– 4.3) µm, L = 4.97 µm, W = 3.64 µm, Q = 1.32–1.41 (n = 60/2).

Additional specimen (paratype) examined:— CHINA. Yunnan Province, Honghe, Pingbian County, Daweishan National Nature Reserve , E 103°30′10′′, N 23°42′07′′, alt. 1500 m, on fallen angiosperm branch, 1 August 2019, CLZhao 17781 ( SWFC!) , GenBank No. (ITS MW 302340 ; nLSU MW 293869 ) .

Figures

FIGURE 5. Basidiomata of Trechispora xantha. Bars: A = 1 cm, B = 1 mm (holotype). Photos by: Tong-Kai Zong.

FIGURE 6. Microscopic structures of Trechispora xantha (drawn from the holotype). A: Basidiospores. B: Basidia and basidioles. C: A section of hymenium. Bars: A = 5 µm, B–C = 10 µm. Drawings by: Tong-Kai Zong.