Lyomyces macrosporus C.L. Zhao, 2020

Chen, Jun-Zhu & Zhao, Chang-Lin, 2020, Morphological and molecular identification of four new resupinate species of Lyomyces (Hymenochaetales) from southern China, MycoKeys 65, pp. 101-118 : 101

Lyomyces macrosporus C.L. Zhao sp. nov. Figs 4 , 8

Holotype.

China. Yunnan Province: Puer, Jingdong County, Taizhong Town, Ailaoshan National Nature Reserve, on fallen branch of angiosperm, 24 August 2018, CLZhao 8605 (holotype in SWFC).

Etymology.

The epithet macrosporus (Lat.): refers to the larger basidiospores.

Basidiomata.

Annual, resupinate, subceraceous when fresh, becoming pruinose upon drying, up to 22 cm long and 3 cm wide, 100-200 µm thick. Hymenial surface reticulate, cream when fresh, turning cream to buff upon drying. Margin narrow, white to buff.

Hyphal system.

Monomitic; generative hyphae with clamp connections, hyaline, thick-walled, branched, 2.5-4 µm in diameter, IKI-, cyanophilous; tissues unchanged in KOH. Numerous crystals present among hyphae.

Hymenium.

Three kinds of cystidia: 1) capitate, hyaline, thin-walled, 19-35 × 3-7 µm; 2) tapering, hyaline, thin-walled, 13-20 × 2.5-4 µm; 3) moniliform, hyaline, thin-walled, 15-22 × 4.5-6 µm; fusoid cystidioles present, hyaline, thin-walled, 15-20 × 2.5-4 µm. Basidia subclavate to clavate, constricted, hyaline, thin-walled, with four sterigmata and a basal clamp connection, 22.2-38 × 4.5-7 µm.

Spores.

Basidiospores ellipsoid, hyaline, slightly thick-walled, smooth, IKI-, cyanophilous, guttulate, (6.4-)6.7-8.9(-9.1) × 4.4-5.4(-5.7) µm, L = 7.84 µm, W = 4.93 µm, Q = 1.48-1.8 (n = 120/4).

Ecology and distribution.

Lignicolous, causing a white rot. China.

Additional specimens examined.

China. Yunnan Province: Puer, Jingdong County, Taizhong Town, Ailaoshan National Nature Reserve, on fallen branch of angiosperm, 4 October 2017, CLZhao 3951; Wuliangshan National Nature Reserve, on fallen branch of angiosperm, 6 October 2017, CLZhao 4516, CLZhao 4531 (SWFC).

Figures

Figure 4. Basidiomata of Lyomyces macrosporus (holotype). Scale bars: 1 cm (A); 5 mm (B).

Figure 8. Microscopic structures of Lyomyces macrosporus (drawn from the holotype) A basidiospores B basidia and basidioles C cystidia D cystidioles E a cross section of basidiomata. Scale bars: 10 μm (A-E).