Lyomyces niveomarginatus Q. Yuan & C. L. Zhao, 2024

Yuan, Qi, Li, Yunchao, Dai, Yunfei, Wang, Kunyan, Wang, Yixuan & Zhao, Changlin, 2024, Morphological and molecular identification for four new wood-inhabiting species of Lyomyces (Basidiomycota) from China, MycoKeys 110, pp. 67-92 : 67-92

Lyomyces niveomarginatus Q. Yuan & C. L. Zhao sp. nov.

Figs 5 , 6

Type material.

Holotype. China • Yunnan Province, Wenshan, Wenshan National Nature Reserve , GPS coordinates 23°21'N, 104°10'E, altitude 1950 m, on a fallen branch of angiosperm, leg. C. L. Zhao, 26 July 2019, CLZhao 16360 ( SWFC).

Etymology.

Niveomarginatus (Lat.) refers to the niveous margin of basidiomata.

Description.

Basidiomata annual, resupinate, adnate, subceraceous, without odour and taste when fresh and up to 7.5 cm long, 2 cm wide, 150 µm thick. Hymenial surface crackled, white to cream when fresh, to cream to slightly buff upon drying. Sterile margin distinct, whitish and up to 2 mm wide.

Hyphal system monomitic, generative hyphae with clamp connections, colourless, thin-walled, branched, 1.5–3.5 µm in diameter; IKI –, CB –, tissues unchanged in KOH. Numerous crystals present amongst generative hyphae.

Cystidia of two types: (1) fusoid, colourless, thin-walled, smooth, 25–29 × 2–3 µm; (2) clavate, colourless, thin-walled, smooth, 20–25.5 × 4.5–5.5 µm; basidia subclavate, with 4 sterigmata and a basal clamp connection, 23–29 × 2.5–3.5 µm.

Basidiospores ellipsoid, colourless, thin-walled, smooth, with one oil drop, CB –, IKI –, 4.5–7 × (2.5 –) 3–4 µm, L = 5.51 µm, W = 3.15 µm, Q = 1.75 (n = 30 / 1).

Additional specimens examined

(paratypes). China • Yunnan Province, Wenshan, Wenshan National Nature Reserve , GPS coordinates 23°21'N, 104°10'E, altitude 1950 m, on a fallen branch of angiosperm, leg. C. L. Zhao, 7 August 2024, CLZhao 40333, CLZhao 40334 ( SWFC) .

Figures

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

Figure 6. Microscopic structures of Lyomyces niveomarginatus (holotype): basidiospores (A), basidia (B), basidioles (C), fusoid cystidia (D), clavate cystidia (E), a section of hymenium (F). Scale bars: 20 µm (A – F).