Gloeocystidiopsis shenghuae S.H. He & Y.F. Cao, 2025

Gloeocystidiopsis shenghuae S.H. He & Y.F. Cao , sp. nov. MB 843420 View Materials . Fig. 7 View Fig .

Etymology: The species epithet “ shenghuae ” is named to honour the mycologist Dr. Sheng-Hua Wu (National Museum of Natural Science, Taiwan) who contributed to the taxonomy of Gloeocystidiellum s. lat.

Typus: China, Guizhou Province, Bijie County, Bailidujuan Forest Park, on dead angiosperm branch, 5 Jul. 2018, S.H. He, He 5411 (holotype BJFC 026472 About BJFC , isotype in BJM) .

Basidiomes annual, resupinate, effused, closely adnate, inseparable, membranaceous to coriaceous, at first as small patches, later confluent up to 3 cm long, 1.5 cm wide, 200– 300 µm thick. Hymenophore smooth, pale orange (5A3), light orange [5A(4–5)] to greyish orange [5B(3–5)], unchanged in KOH, uncracked; margin thinning out, indistinct, concolourous with hymenophore. Hyphal system monomitic; all hyphae without clamps. Subiculum indistinct; hyphae colourless, slightly thick-walled, smooth, rarely branched, frequently septate, slightly agglutinated, more or less parallel to substrate, 1.8–2.6 µm diam. Subhymenium distinct; hyphae colourless, thin- to slightly thick-walled, smooth, rarely branched, moderately septate, interwoven, 1.5–2.2 µm diam. Gloeocystidia subfusiform to subulate, colourless, thick-walled, smooth, with one to several indistinct constrictions at the apex, embedded or slightly projecting, 60–80 × 10– 14 µm. Hyphidia scattered, colourless, thin-walled, smooth, unbranched. Basidia subclavate, often with a constriction, colourless, thin-walled, smooth, with four sterigmata and a basal simple septum, 30–45 × 9–12 µm; basidioles dominant, in shape similar to basidia, but slightly smaller. Basidiospores ellipsoid to broadly ellipsoid, colourless, thin-walled, finely echinulate, strongly amyloid, acyanophilous, (9–)10–12 × 7–8.5(–8.9) µm, L = 11 µm, W = 7.9 µm, Q = 1.4 (n = 30/1).

Notes: Gloeocystidiopsis shenghuae was nested within the Gloeocystidiopsis lineage and is characterized by large basidiospores, which can be used to distinguish it from all other species in the clade (≤ 8 µm long, ≤ 5 µm wide; Jülich 1982, Wu 1996, Boidin et al. 1997, Dai et al. 2017a).