Radulomyces bambusinus 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

Radulomyces bambusinus J. H. Dong & C. L. Zhao sp. nov.

Figs 5 B , 8 , 9

Holotype.

China • Yunnan Province, Zhaotong, Daguan County, Wumengshan National Nature Reserve , GPS coordinates 27°46'N, 103°52'E, altitude 2200 m asl., on the dead bamboo, leg. C. L. Zhao, 6 November 2023, CLZhao 35383 ( SWFC).

Etymology.

bambusinus (Lat.): referring to the type species growing on bamboo.

Basidiomata.

Annual, resupinate, adnate, soft membranous, without odour or taste, becoming coriaceous upon drying, up to 5 cm long, 2 cm wide, 50–100 µm thick. Hymenial surface tuberculate, cream to pinkish when fresh, turning to pinkish-white to pink upon drying. Sterile margin cream to slightly pinkish, thinning out, up to 1 mm wide.

Hyphal system.

Monomitic, generative hyphae with clamp connections, colorless, thin-walled, branched, interwoven, 2.5–3.5 µm in diameter; IKI –, CB –, tissues unchanged in KOH.

Hymenium.

Cystidia and cystidioles absent. Basidia clavate to barrelled, with 4 sterigmata and a basal clamp connection, occasionally constricted in the middle, 23.5–40.5 × 7.5–10.5 µm; basidioles dominant, similar to basidia in shape, but slightly smaller.

Basidiospores.

Subglobose, slightly thick-walled, smooth, colorless, CB +, (5.7 –) 6–7.5 (– 8) × 5.5–7.3 (– 7.5) µm, L = 6.76 µm, W = 6.43 µm, Q = 1.01–1.18, Q m = 1.05 ± 0.05 (n = 60 / 2).

Additional specimen (paratype) examined.

China • Yunnan Province, Zhaotong, Daguan County, Wumengshan National Nature Reserve , GPS coordinates 27°46'N, 103°52'E, altitude 2200 m asl., on the dead bamboo, leg. C. L. Zhao, 6 November 2023, CLZhao 35384 ( SWFC) .

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 8. Basidiomata of Radulomyces bambusinus in general and detailed views A, B CLZhao 35383 (holotype) C, D CLZhao 35384.

Figure 9. Microscopic structures of Radulomyces bambusinus (holotype, CLZhao 35383) A basidiospores B basidia C basidioles D part of the vertical section of hymenium. Scale bars: 10 µm (A – D).