Scopuloides farinacea Z. R Gu & C. L. Zhao, 2025

Gu, Zirui, Zhou, Chunqin, Zhang, Jianling, Liu, Yu, Deng, Qiaohua, Yang, Rongcong, Yang, Shunqiang & Zhao, Changlin, 2025, Taxonomy and phylogeny of Irpicaceae and Meruliaceae (Polyporales, Basidiomycota) with descriptions of four new species from southwestern China, MycoKeys 119, pp. 197-234 : 197-234

Scopuloides farinacea Z. R Gu & C. L. Zhao sp. nov.

Figs 14 , 15 , 16

Diagnosis.

Differs from other Scopuloides species by its coriaceous, pale cream to buff basidiomata, a monomitic hyphal system with simple-septate generative hyphae, and ellipsoid basidiospores measuring 2.8–3.5 × 1.4–2 µm.

Holotype.

China • Yunnan Province, Dehong, Yingjiang County, Tongbiguan Provincial Nature Reserve , GPS coordinates: 24°42'N, 97°56'E, altitude 850 m asl., on the fallen angiosperm branch, leg. C. L. Zhao, 19 July 2023, CLZhao 30181, GenBank: ITS = PV 470559 ; nLSU = PV 474204 ( SWFC).

Etymology.

Farinacea (Latin or Greek origin): refers to the farinaceous hymenial surface of the type specimens.

Description.

Basidiomata. Annual, resupinate, closely adnate, coriaceous, without odor or taste when fresh, up to 20 cm long, 3 cm wide, and 400 μm thick at center. Hymenophore grandinoid, white to cream when fresh, pale cream to buff upon drying. Sterile margin white to pale cream, up to 1 mm.

Hyphal system. Monomitic; generative hyphae with simple septa, colorless, thin- to slightly thick-walled, smooth, branched, more or less parallel with substrate, 1.7–5.5 µm in diameter, IKI –, CB –; tissues unchanged in KOH. Hymenium. Lamprocystidia abundant, conical or subulate, colorless, simple-septate at base, heavily encrusted, originating from trama or subiculum, immersed or projecting, 21.2–39.5 × 6–13 µm. Basidia subcylindrical, slightly flexuous, with a basal simple septum and four sterigmata, 4.6–8 × 1.8–2.7 µm; basidioles numerous, in shape similar to basidia but slightly smaller. Basidiospores. Basidiospores ellipsoid, colorless, thin-walled, smooth, IKI –, CB –, (2.6 –) 2.8–3.5 (– 3.7) × (1.2 –) 1.4–2 µm, L = 3.08 µm, W = 1.65 µm, Q = 1.79–1.92 (n = 90 / 3).

Additional specimens examined (paratypes).

China • Yunnan Province, Zhaotong, Yiliang County, Xiaocaoba Town, Wumengshan National Nature Reserve , Wangfu Waterfall , GPS coordinates: 22°19'N, 103°43'E, altitude 1800 m asl., on the fallen angiosperm branch, leg. H. M. Zhou, 18 August 2024, HMZhou 153, GenBank: ITS = PV 470560 , nLSU = PV 474205 ; • Dehong, Yingjiang County, Tongbiguan Provincial Nature Reserve , GPS coordinates: 24°42'N, 97°56'E, altitude 850 m asl., on the angiosperm trunk, leg. C. L. Zhao, 18 July 2023, CLZhao 30005, GenBank: ITS = PV 470558 ; nLSU = PV 474203 ( SWFC) .

Figures

Figure 14. Basidiomata of Scopuloides farinacea (holotype, CLZhao 30181). A. Basidiomata on the substrate; B. Macroscopic characteristics of hymenophore. Scale bars: 1 cm (A); 1 mm (B).

Figure 15. Sections of hymenium of Scopuloides farinacea (holotype, CLZhao 30181). A – E. Basidia and basidioles; F – K. Basidiospores; L – N. Cystidia; O – S. Part of the generative hyphae. Scale bars: 10 µm (A – S); 10 × 100 Oil.

Figure 16. Microscopic structures of Scopuloides farinacea (holotype, CLZhao 30181). A. Basidiospores; B. Basidia and basidioles; C. Cystidia; D. Part of the vertical section of hymenium. Scale bars: 5 µm (A); 10 µm (B – D).