Lyomyces cremeus 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 cremeus C.L. Zhao sp. nov. Figs 3 , 7

Holotype.

China. Yunnan Province: Jingdong County, Taizhong Town, Ailaoshan Ecological Station, on fallen branch of angiosperm, 23 August 2018, CLZhao 8295 (SWFC).

Etymology.

The epithet cremeus (Lat.): refers to the cream hymenial surface.

Basidiomata.

Annual, resupinate, ceraceous when fresh, becoming membranaceous upon drying, up to 13 cm long and 5 cm wide, 50-100 µm thick. Hymenial surface smooth, pale cream when fresh, turn cream upon drying. Margin narrow, white to cream.

Hyphal system.

Monomitic; generative hyphae with clamp connections, hyaline, thick-walled, branched, 3-5 µm in diameter, IKI-, cyanophilous; tissues unchanged in KOH. Numerous crystals present among hyphae.

Hymenium.

Two kinds of cystidia: 1) capitate, hyaline, thin-walled, 20-40 × 3-5 µm, smooth or slightly encrusted; 2) tapering, hyaline, thin-walled, 18-35 × 3-4.5 µm, smooth or slightly encrusted; cystidioles present, hyaline, thin-walled, 15-20 × 2.5-4 µm. Basidia clavate, with four sterigmata and a basal clamp connection, 9-18.5 × 3-6 µm.

Spores.

Basidiospores ellipsoid, hyaline, thin-walled to slightly thick-walled, smooth, IKI-, cyanophilous, guttulate, 4.5-5.6(-5.8) × 3.3-4.3(-4.5) µm, L = 5.01 µm, W = 3.94 µm, Q = 1.25-1.3 (n = 90/3).

Ecology and distribution.

Lignicolous, causing a white rot. China.

Additional specimens examined.

China. Yunnan Province: Yuxi, Xinping County, Shimenxia Forestry Park, on fallen branch of angiosperm, 21 August 2017, CLZhao 2812; Puer, Jingdong County, Wuliangshan National Nature Reserve, on fallen branch of angiosperm, 5 October 2017, CLZhao 4138 (SWFC).

Figures

Figure 3. Basidiomata of Lyomyces cremeus (holotype). Scale bars: 1 cm (A); 5 mm (B).

Figure 7. Microscopic structures of Lyomyces cremeus (drawn from the holotype) A basidiospores B basidia and basidioles C cystidia D cystidioles E a cross section of basidiomata. Scale bars: 5 μm (A); 10 μm (B-E).