Xenasmatella tenuis 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 : 116-118

Xenasmatella tenuis C.L. Zhao , sp. nov. Figs. 2 , 5

MycoBank no.: MB 836456

Holotype:— CHINA. Yunnan Province, Wenshan, Xichou County, Xiaoqiaogou National Nature Reserve , on fallen angiosperm branch, 16 January 2019, CLZhao 11258 ( SWFC!), (Genbank MT 832959 , ITS).

Etymology:— Tenuis (Lat.) : referring to very thin basidiomata.

Fruiting body:—Basidiomata annual, resupinate, adnate, very thin, without odor or taste, and becoming ceraceous when fresh, ceraceous to membranous upon drying, up to 10 cm long, less than 100 µm thick. Hymenial surface white when fresh, white to lilac upon drying. Margin sterile, indistinct, white.

Hyphal structure:—Hyphal system monomitic; generative hyphae with clamp connections, hyaline, thin-walled, branched, 1–2.5 µm in diam., IKI–, CB –, tissues unchanged in KOH.

Hymenium:—Cystidia and cystidioles absent; basidia pleural, barrel-shaped, with 4 sterigmata and a basal clamp connection, 9–12.5 × 3.5–6 µm; basidioles dominant, in shape similar to basidia, but slightly smaller.

Spores:—Basidiospores ellipsoid, hyaline, thin-walled, warted throughout, asperulate with blunt spines up to 0.3 µm long, IKI–, CB –, 3.3–4.8 × 2.3–3.4(–3.6) µm, L = 4.13 µm, W = 2.96 µm, Q = 1.38–1.41 (n = 60/2).

Rot type:—White rot. Additional specimen examined:— CHINA. Yunnan Province, Puer, Jingdong County, Wuliangshan National

Forestry Reserve , on fallen angiosperm branch, 6 October 2017, CLZhao 4528 (GenBank No. MT 832960 , ITS)

( SWFC!).

Figures

FIGURE 2. A basidiomata of Xenasmatella tenuis (holotype). Bar: A = 1 cm; B = 1 mm.

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