Xenasmatella rhizomorpha 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 : 115-116

Xenasmatella rhizomorpha C.L. Zhao , sp. nov. Figs. 1 , 4

MycoBank no.: MB 836455

Holotype:— CHINA. Yunnan Province, Puer, Jingdong County, Wuliangshan National Nature Reserve , on angiosperm trunk, 7 January 2019, CLZhao 9847 ( SWFC!), GenBank No. ( MT 832953 , ITS).

Etymology:— Rhizomorpha (Lat.): referring to rhizomorphic basidiomata.

Fruiting body:— Basidiomata annual, resupinate, becoming gossypine when fresh, membranaceous upon drying, up to 8 cm long, 200–600 µm thick. Hymenial surface byssaceous to reticulate, white to olivaceous buff when fresh, clay-buff to cinnamon upon drying. Color unchanged with alkali. Rhizomorphs present, white.

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

Hymenium:—Cystidia and cystidioles absent; basidia pleural, clavate, with 4 sterigmata and a basal clamp connection, 10.5–17.5 × 3.5–6.5 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 0.2 µm long, IKI–, CB –, 3.1–4.9 × 2.3–3.3 µm, L = 4.09 µm, W = 2.82 µm, Q = 1.35–1.64 (n = 180/6).

Rot type:—White rot.

Additional specimens examined:— CHINA. Yunnan Province, Yuxi, Xinping County, Jinshan Primeval Forest Park, on angiosperm trunk , 2 January 2019, CLZhao 9156 (GenBank No. MT 832954 , ITS), CLZhao 9170 (GenBank No. MT 832955 , ITS), CLZhao 9172 (GenBank No. MT 832956 , ITS) ; 6 January 2019, CLZhao 9734 (GenBank No. MT 832957 , ITS) ; 7 January 2019, CLZhao 9885 (GenBank No. MT 832958 , ITS) ( SWFC!) .

Figures

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

FIGURE 4. Microscopic structures of Xenasmatella rhizomorpha (drawn from the holotype). A. Basidiospores. B. Basidia and basidioles. C. A section of hymenium. Bars: A = 5 μm; B, C = 10 μm.