Phanerochaete fissurata Y. Xu & C. L. Zhao, 2025

Xu, Ying, Yang, Yang, Yang, Xin, Chen, Daxiang, Zheng, Wen, Shen, Kaize, Zhang, Sicheng & Zhao, Changlin, 2025, Molecular phylogeny and taxonomy reveal two new genera and five new species in Phanerochaetaceae (Polyporales) from Yunnan, Southwest China, MycoKeys 113, pp. 263-294 : 263-294

Phanerochaete fissurata Y. Xu & C. L. Zhao sp. nov.

Figs 9 , 10

Diagnosis.

Differs from other species by the gray-brown and cracked hymenial surface, a monomitic hyphal system with brownish subicular hyphae, narrowly clavate basidia, and ellipsoid basidiospores.

Holotype.

China • Yunnan Province, Zhaotong, Daguan County, Wumengshan National Nature Reserve , 28°08'N, 103°58'E, altitude 1800 m, on the fallen angiosperm branch, leg. C. L. Zhao, 17 October 2023, CLZhao 35311 ( SWFC).

Etymology.

fissurata (Lat.) refers to the holotype having a cracked hymenial surface.

Fruiting body.

Basidiomata annual, resupinate, slightly adnate, without odor or taste when fresh, soft coriaceous when fresh, hard coriaceous upon drying, up to 7.7 cm long, 1.8 cm wide, 50–120 μm thick. Hymenial surface smooth, pale cream when fresh, gray-brown when dry, unchanged in KOH, cracked. Sterile margin narrow, gray brown, up to 1.5 mm wide.

Hyphal system.

Monomitic; generative hyphae with simple septa, IKI –, CB –; tissues unchanged in KOH. Subicular hyphae brownish, thick-walled, slightly branched, interwoven, slightly flexuous, 3.5–5.5 μm in diameter. Subhymenium indistinct, hyphae in this layer similar to subicular hyphae.

Hymenial layer.

Generative hyphae vertical, short-celled, colorless, 3–4.5 μm in diameter, thin- to slightly thick-walled. Cystidia and cystidioles absent. Basidia narrowly clavate, thin-walled, with four sterigmata and a simple septum, 17.5–21.5 × 3.5–5.5 μm. Basidioles in shape are similar to basidia, but slightly smaller.

Basidiospores.

Ellipsoid, colorless, thin-walled, smooth, occasionally with small oil drops, IKI –, CB –, 4–5.5 (– 6) × 2–3 (– 3.5) μm, L = 4.70 μm, W = 2.43 μm, Q = 1.85–2.02 (n = 60 / 2).

Additional specimen examined

(paratype). • Yunnan Province, Zhaotong, Daguan County, Wumengshan National Nature Reserve , 28°08'N, 103°58'E, altitude 1800 m, on the fallen angiosperm branch, leg. C. L. Zhao, 17 October 2023, CLZhao 35321 ( SWFC) .

Figures

Figure 9. Basidiomata of Phanerochaete fissurata in general and detailed views (CLZhao 35311, holotype). Scale bars: 1 cm (A); 1 mm (B).

Figure 10. Microscopic structures of Phanerochaete fissurata (holotype, CLZhao 35311) A basidiospores B basidia & basidioles C a section of the fruit body. Scale bars: 5 µm (A); 10 µm (B – C); 10 × 100 Oil.