Lyomyces bambusinus 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 bambusinus C.L. Zhao sp. nov. Figs 2 , 6

Holotype.

China. Yunnan Province: Puer, Zhenyuan County, Heping Town, Ailaoshan National Nature Reserve, on dead bamboo, 11 January 2018, CLZhao 4831 (SWFC).

Etymology.

The epithet bambusinus (Lat.): refers to the occurrence on bamboo.

Basidiomata.

Annual, resupinate, ceraceous when fresh, becoming brittle and cracking upon drying, up to 20 cm long and 8 cm wide, 100-200 µm thick. Hymenial surface colliculose to tuberculate, white to cream when fresh, turning cream to buff upon drying. Margin narrow, concolorous with hymenial surface.

Hyphal system.

Monomitic; generative hyphae with clamp connections, hyaline, thick-walled, branched, 2.5-3.9 µm in diameter, IKI-, cyanophilous; tissues unchanged in KOH. Numerous crystals present among hyphae.

Hymenium.

Two kinds of cystidia: 1) capitate, hyaline, thin-walled, 35-55 × 4-7 µm, smooth or slightly encrusted; 2) tapering, hyaline, thin-walled, 40-65 × 4-5.5 µm, smooth or slightly encrusted; cystidioles present, hyaline, thin-walled, 12-17 × 2-3 µm. Basidia clavate, constricted, thin-walled, with four sterigmata and a basal clamp connection, 16.5-35 × 3.5-7 µm.

Spores.

Basidiospores broadly ellipsoid, hyaline, slightly thick-walled, smooth, IKI-, cyanophilous, guttulate, (4.5-)4.7-5.9 (-6.2) × (3.4-)3.7-4.6(-4.8) µm, L = 5.31 µm, W = 4.19 µm, Q = 1.23-1.3 (n = 120/4).

Ecology and distribution.

On dead bamboo, causing a white rot. China.

Additional specimens examined.

China. Yunnan Province: Puer, Jingdong County, Wuliangshan National Nature Reserve, on dead bamboo, 3 October 2017, CLZhao 3675; Zhenyuan County, Heping Town, Ailaoshan National Nature Reserve, on dead bamboo, 11 January 2018, CLZhao 4808, CLZhao 4840 (SWFC).

Figures

Figure 2. Basidiomata of Lyomyces bambusinus (holotype). Scale bars: 1 cm (A); 5 mm (B).

Figure 6. Microscopic structures of Lyomyces bambusinus (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).