Gloeocystidiellum fissuratum L. Wang & C. L. Zhao, 2025

Wang, Lu, Zhu, Yonggao, He, Siyuan, Jabeen, Sana & Zhao, Changlin, 2025, Additions to the coriaceous families Peniophoraceae and Stereaceae (Russulales): Six novel wood-inhabiting taxa in the genera Conferticium, Gloeocystidiellum, and Peniophora from southwest China, MycoKeys 115, pp. 273-308 : 273-308

publication ID	https://doi.org/10.3897/mycokeys.115.147044
persistent identifier	https://treatment.plazi.org/id/84BA4B26-374C-556C-A2D7-FB011E65BAAA
treatment provided by	MycoKeys by Pensoft
scientific name	Gloeocystidiellum fissuratum L. Wang & C. L. Zhao
status	sp. nov.

Treatment

Gloeocystidiellum fissuratum L. Wang & C. L. Zhao sp. nov.

Figs 9 View Figure 9 , 10 View Figure 10

Holotype.

China. • Yunnan Province: Zhaotong, Wumengshan National Nature Reserve , GPS coordinates: 27°77'N, 104°25'E, altitude: 1900 m asl., on the fallen angiosperm branch, leg. C. L. Zhao, 28 Aug 2023, CLZhao 32498, GenBank: ITS = PQ 287851 ( SWFC!).

Diagnosis.

It is characterized by white to cinnamon-buff, membranaceous basidiomata with grandinioid and cracking hymenophore surfaces, a monomitic hyphal system with clamped generative hyphae, numerous, variable in size and shape gloeocystidia, and subglobose basidiospores.

Etymology.

Fissuratum (Lat.): refers to the species having a cracking hymenial surface.

Description.

Basidiomata. Annual, resupinate, closely adnate, membranaceous, without odor or taste when fresh, up to 8.5 cm long, 2 cm wide, and 300 μm thick. Hymenophore grandinioid, cracking, white to cinnamon-buff when fresh, cinnamon-buff upon drying. Sterile margin cream, up to 2 mm.

Hyphal system. Monomitic; generative hyphae with clamp connections, colorless, thin-walled, smooth, branched, interwoven, 2–3 µm in diameter, IKI –, CB –; tissues unchanged in KOH.

Hymenium. Gloeocystidia numerous, variable in size and shape, subclavate to obclavate, colorless, thin-walled, smooth, mostly 57–88 × 9–10 µm. Basidia subcylindrical to subclavate, slightly flexuous, with a basal clamp connection and four sterigmata, 13–16 × 4–5 µm; basidioles numerous, in shape similar to basidia but smaller.

Spores. Basidiospores subglobose, colorless, thin-walled, verrucose, IKI +, CB –, (3 –) 3.5–4.5 (– 5) × 2.5–3.5 (– 4) µm, L = 4.04 µm, W = 3.06 µm, Q = 1.26–1.32 (n = 90 / 3).

Additional specimens examined (paratypes).

China. • Yunnan Province: Zhaotong, Wumengshan National Nature Reserve , GPS coordinates: 27°77'N, 104°25'E, altitude: 1900 m asl., on angiosperm stump, leg. C. L. Zhao, 28 Aug 2023, CLZhao 32247, GenBank: ITS = PQ 287849; nLSU = PQ 295865 ; on the fallen branch of Picea , leg. C. L. Zhao, 28 Aug 2023, CLZhao 32303, GenBank: ITS = PQ 287850, nLSU = PQ 295866 ( SWFC!) .