Steccherinum tenuissimum C.L. Zhao & Y.X. Wu, sp. Nov.2021
MycoBank No.: MB 837795
Holotype: China. Yunnan Province, Pu’er, Laiyanghe National Forest Park, on fallen angio[1]sperm branch, 30 September 2017, CLZhao 3
Sexual morph:Annual, adnate, without odour or taste when fresh, becoming membranac[1]eous up on drying, very thin, up to 20 cm long, 3 cm wide, 50–100 μm thick.
Hyphal structure: Hyphal system dimitic, generative hyphae with clamp connections, col[1]ourless, thin-walled, branched, interwoven, 1.8–3.5 μm in diameter, IKI–, CB–; skeletal hyphae colourless, thick-walled, unbranched, 2.4–4.5 μm in diameter, IKI–, CB+; tissues unchanged in KOH.
Hymenium: Cystidia numerous, colourless, strongly encrusted, 22–39 × 4.5–6 μm; cysti[1]dioles absent. Basidia subclavate, with 4-sterigmata and basal clamp connections, 9.5– 19 × 2.5–5.5 μm; basidioles dominant, in shape similar to basidia, but slightly smaller. Spores: Basidiospores ellipsoid, colourless, thin-walled, smooth, with oil drops, IKI–, CB–, 3–5(–5.5) × 2–3.5 μm, L = 4.16 μm, W = 2.86 μm, Q = 1.40–1.52 (n = 120/4).
Asexual morph: Undetermined
Hymenial surface odontioid, with round aculei, 3–4 per mm, 0.2–0.5 mm long, white to cream when fresh, turn[1]ing to cream to olivaceous buff upon drying.
Habitat：,on fallen angiosperm branch
Distribution: : China. Yunnan Province, Yuxi, Xinping County, Mopanshan National Forest Park,
GenBank Accession: CLZhao 894 its MW204581 ;nlsu MW204570 .CLZhao 3153 its MW204582;nlsu MW204571. CLZhao 4294 its MW204583;nlsu MW204572. CLZhao 5100 its MW204584;nlsu MW204573.
Notes:
Reference:[1] Wu, Y. X. , Wu, J. R. , & Zhao, C. L. . (2021). Steccherinum tenuissimum and s. xanthum spp. nov. (polyporales, basidiomycota): new species from china. PLoS ONE, 16(1), e0244520.
Basidiomata of Steccherinum tenuissimum. Bars: A = 1 cm, B = 1 mm (holotype)
Microscopic structures of Steccherinum tenuissimum (drawn from the holotype). A: Basidiospores. B: Basidia
and basidioles. C: Cystidia. D: A section of hymenium. Bars: A = 5 μm, B–D = 10 μm
