Paradonkia farinacea 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

Paradonkia farinacea Y. Xu & C. L. Zhao sp. nov.

Figs 3 , 4

Diagnosis.

Differs from other species by the farinaceous basidiomata with the pale cream to gray cream hymenial surface, a monomitic hyphal system, cystidia and cystidioles absent, narrowly clavate basidia, ellipsoid basidiospores.

Holotype.

China • Yunnan Province, Qujing, Zhanyi District, Lingjiao Town , Xiajia Village , 25°58'N, 103°47'E, altitude 2000 m, on the fallen angiosperm branch, leg. C. L. Zhao, 6 March 2023, CLZhao 27184 ( SWFC).

Etymology.

farinacea (Lat.): refers to the holotype having a farinaceous hymenial surface.

Fruiting body.

Basidiomata annual, resupinate, adnate, without odor or taste when fresh, farinaceous, upon drying, up to 6.5 cm long, 1.3 cm wide, 110–180 μm thick. Hymenial surface smooth, white to cream when fresh, pale cream to gray cream when dry, unchanged in KOH. Sterile margin narrow, gray cream, 1 mm wide.

Hyphal system.

Monomitic, generative hyphae with simple septa and clamp connections, IKI –, CB –; tissues unchanged in KOH. Subicular hyphae mainly horizontal, colorless, thick-walled, slightly flexuous, rarely branched, interwoven, 6.0–7.5 μm in diameter. Crystals abundant, crowded. Subhymenium indistinct, hyphae in this layer similar to subicular hyphae.

Hymenial layer.

Generative hyphae short-celled, colorless, 3–4 μm in diameter, thin- to slightly thick-walled. Crystals abundant, crowded. Cystidia and cystidioles absent. Basidia narrowly clavate, slightly flexuous, thin-walled, with four sterigmata and a simple septum, 25–29 × 4.5–6.5 μm. Basidioles similar to basidia in shape, but slightly smaller.

Basidiospores.

Ellipsoid, colorless, thin-walled, smooth, occasionally with oil drops, IKI –, CB –, 4–6 (– 6.5) × (2.5 –) 3–4 (– 4.5) μm, L = 4.87 μm, W = 3.37 μm, Q = 1.45 (n = 30 / 1).

Additional specimen examined

(paratype). • Yunnan Province, Qujing, Zhanyi District, Lingjiao Town , Xiajia Village , 25°58'N, 103°47'E, altitude 2000 m, on the fallen angiosperm branch, leg. C. L. Zhao, 6 March 2023, CLZhao 27221 ( SWFC) .

Figures

Figure 3. Basidiomata of Paradonkia farinacea in general and detailed views (CLZhao 27184, holotype). Scale bars: 1 cm (A); 1 mm (B).

Figure 4. Microscopic structures of Paradonkia farinacea (holotype, CLZhao 27184) A basidiospores B basidia C basidioles D a section of the fruit body. Scale bars: 5 µm (A); 10 µm (B – D); 10 × 100 Oil.