Xylodon granulans J. L. Zhang, H. M. Zhou & C. L. Zhao, 2025

Zhang, Jianling, Gu, Zirui, Zhou, Chunqin & Zhou, Hongmin, 2025, Molecular phylogeny and morphology reveal four new species in Hymenochaetales and one new species in Cantharellales from Southwestern China, MycoKeys 115, pp. 87-135 : 87-135

Xylodon granulans J. L. Zhang, H. M. Zhou & C. L. Zhao sp. nov.

Figs 15 , 16

Diagnosis.

Xylodon granulans differs from X. wenshanensis by its broadly ellipsoid, thin-walled basidiospores measuring 3.8–4.2 × 2.9–3.3 μm.

Holotype.

China • Yunnan Province, Honghe, Pingbian County, Daweishan National Nature Reserve , 28°42'N, 114°11'E, evel. 1356 m asl. on fallen angiosperm branch, 1 August 2019, CLZhao 17866 ( SWFC).

Etymology.

Granulans (Lat.) refers to the granulated hymenial surface.

Description.

Basidiomata. Basidiomata annual, resupinate, adnate, membranous, without odor or taste when fresh, up to 2.4 cm long, 1.3 cm wide, and 50–70 μm thick. Hymenial surface grandinioid, cream when fresh, white to slightly cream when dry. Sterile margin thin, indistinct, slightly cream, up to 1 mm.

Hyphal system. Monomitic; generative hyphae with clamp connections slightly encrusted with crystals amongst generative hyphae, hyaline, slightly thick-walled, frequently branched, interwoven, 2.0–2.5 μm in diam, IKI –, CB –; tissues unchanged in KOH.

Hymenium. Cystidia of two types: (1) Capitate cystidia in hymenium and subiculum, hyaline, slightly thick-walled, smooth, slightly constricted at the neck, with a globose head, 4.5–23.5 × 3.0–4.5 μm; (2) Clavate cystidia, slightly sinuous, hyaline, slightly thick-walled, smooth, 13.0–24.0 × 4.0–5.0 μm. Basidia clavate, slightly sinuous, with four sterigmata and a basal clamp connection, 9.0–12.0 × 3.5–4.5 μm; basidioles dominant, in shape similar to basidia, but slightly smaller. Basidiospores. Broadly ellipsoid, some of them with an oily drop, hyaline, thin-walled, smooth, IKI –, CB –, (3.7 –) 3.8–4.2 (– 4.3) × (2.8 –) 2.9–3.3 (– 3.4) μm, L = 4.03 μm, W = 3.12 μm, Q = 1.29–1.29 (n = 60 / 2).

Other specimen examined.

China • Yunnan Province, Honghe, Pingbian County, Daweishan National Nature Reserve , 28°42'N, 114°11'E, evel. 1356 m asl., on fallen angiosperm branch, 1 August 2019, CLZhao 17804 ( SWFC) .

Figures

Figure 15. Basidiomata of Xylodon granulans (holotype, CLZhao 17866) A the front of the basidiomata B characteristic hymenophore. Scale bars: 1 cm (A); 1 mm (B).

Figure 16. Microscopic structures of Xylodon granulans (holotype, CLZhao 17866) A basidiospores B basidia and basidioles C – E cystidia F a section of hymenium. Scale bars: 5 μm (A); 10 μm (B – F); 10 × 100 oil.