Xenasmatella xinpingensis C.L. Zhao, 2021

Zong, Tong-Kai, Wu, Jian-Rong & Zhao, Chang-Lin, 2021, Three new Xenasmatella (Polyporales, Basidiomycota) species from China, Phytotaxa 489 (2), pp. 111-120 : 118

Xenasmatella xinpingensis C.L. Zhao , sp. nov. Figs. 3 , 6

MycoBank no.: MB 836457

Holotype:— CHINA. Yunnan Province, Yuxi, Xinping County, Mopanshan National Forestry Park , on fallen angiosperm branch, 18 August 2017, CLZhao 2216 ( SWFC!), Genbank ( MT 832961 , ITS).

Etymology:— Xinpingensis (Lat.): referring to the locality (Xinping County) of the type specimens.

Fruiting body:—Basidiomata annual, resupinate, without odor or taste, and becoming soft ceraceous when fresh, irregularly reticulate or somewhat wrinkled upon drying, up to 7 cm long, 100–300 µm thick. Hymenial surface white when fresh and upon drying. Margin sterile, distinct, white.

Hyphal structure:—Hyphal system monomitic; generative hyphae with clamp connections, slightly thick-walled, unbranched, 1.5–3.5 µm in diam., IKI–, CB –, tissues unchanged in KOH.

Hymenium:—Cystidia and cystidioles absent; basidia clavate, with 4 sterigmata and a basal clamp connection, 15.5–20 × 4.5–6.5 µm; basidioles dominant, in shape similar to basidia, but slightly smaller, with oildrops.

Spores:—Basidiospores subglobose to globose, hyaline, thin-walled, warted throughout, asperulate with blunt spines up to 0.7 µm long, IKI–, CB –, 3.5–4.9 × (2.8–)3–4.2 µm, L = 4.13 µm, W = 3.55 µm, Q = 1.15–1.19 (n = 90/3).

Rot type:—White rot.

Additional specimens examined:— CHINA. Yunnan Province, Yuxi, Xinping County, Mopanshan National Forestry Park , on the trunk of Quercus semecarpifolia , 19 August 2017, CLZhao 2467 (GenBank No. MT 832962 , ITS); Shimenxia Forestry Park, on angiosperm trunk, 21 August 2017, CLZhao 2792 (GenBank No. MK 343491, ITS) ( SWFC!) .

Figures

FIGURE 3. A basidiomata of Xenasmatella xinpingensis (holotype). Bar: A = 0.5 cm; B = 1 mm.

FIGURE 6. Microscopic structures of Xenasmatella xinpingensis (drawn from the holotype). A. Basidiospores. B. Basidia and basidioles. C. A section of hymenium. Bars: A = 5 μm; B, C = 10 μm.