Asterostroma paramuscicola J. H. Dong & C. L. Zhao, 2025

Dong, Junhong, Deng, Qiaohua, Chen, Minglan, Chen, Daxiang, Zhou, Chunqin & Zhao, Changlin, 2025, Molecular phylogeny and morphology reveal four new wood-inhabiting fungi of Asterostroma and Radulomyces (Basidiomycota) from Southwestern China, MycoKeys 112, pp. 35-58 : 35-58

Asterostroma paramuscicola J. H. Dong & C. L. Zhao sp. nov.

Figs 5 A , 6 , 7

Holotype.

China • Yunnan Province, Pu’er, Jingdong County, Taizhong Town, Ailaoshan Ecological Station , GPS coordinates 24°31'N, 101°02'E, altitude 2400 m asl., a dead angiosperm tree, leg. C. L. Zhao, 24 August 2018, CLZhao 8594 ( SWFC).

Etymology.

paramuscicola (Lat.): referring to its close phylogenetic relationship with A. muscicola .

Basidiomata.

Annual, resupinate, felted-membranous to pellicular, soft, without odour and taste when fresh, becoming coriaceous upon drying, up to 10 cm long, 5 cm wide, 50–150 µm thick. Hymenial surface smooth, pinkish when fresh, turning to pinkish to slightly salmon-buff upon drying, rhizomorphic. Sterile margin thin, cream to buff, fimbriate, up to 1 mm wide.

Hyphal system.

Dimitic, generative hyphae scattered, simple-septate, colorless, thin-walled, occasionally branched, 2–3.5 µm in diameter, IKI –, CB –, tissues unchanged in KOH. Asterosetae in subiculum abundant, predominant, yellowish brown, thick-walled, regularly star-shaped, 4–6 µm in diameter, weakly dextrinoid, rays up to 75 µm long, with acute tips, CB –, and tissues unchanged in KOH.

Hymenium.

Asterohyphidia in hymenium similar to asterosetae in subiculum, but smaller and less regularly shaped, 2–3.5 µm in diameter, rays up to 25 µm long, usually bifurcated at tips. Gloeocystidia subcylindrical to fusiform, thin-walled, with a basal simple septum, 45–83.5 × 9–21.5 µm; cystidioles absent. Basidia subcylindrical, colorless, with four sterigmata and a basal simple septum, 47.5–58 × 7.5–9.5 µm; basidioles dominant, similar to basidia in shape, but slightly smaller.

Basidiospores.

Subglobose, with a distinct apiculus, spines conical, 2–3 µm long, colorless, thin-walled, echinulate, amyloid, with one guttula, CB –, (7.5 –) 8–8.8 (– 9) × (6.6 –) 7–8 (– 8.5) µm, L = 8.39 µm, W = 7.65 µm, Q = 1.02–1.22, Q m = 1.10 ± 0.06 (n = 30 / 1).

Figures

Figure 5. Sections of hymenium of Asterostroma and Radulomyces A Asterostroma paramuscicola (holotype, CLZhao 8594) B Radulomyces bambusinus (holotype, CLZhao 35383) C Radulomyces fissuratus (holotype, CLZhao 26970) D Radulomyces sinensis (holotype, CLZhao 25667). 10 × 100 Oil.

Figure 6. Basidiomata of Asterostroma paramuscicola in general and detailed views (holotype, CLZhao 8594).

Figure 7. Microscopic structures of Asterostroma paramuscicola (holotype, CLZhao 8594) A basidiospores B basidia C basidioles D gloeocystidia E generative hyphae F asterohyphidia from hymenium G asterosetae from subiculum. Scale bars: 10 µm (A – G).