Cyathus prismaticus Z. Y. Duan & C. L. Zhao 2023, sp. nov.
Creators: name: Duan, Zi-Yan
name: Yang, Xin
name: Liu, Chao-Mao
name: Zhao, Chang-Lin
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Fungi
Basidiomycota
Agaricomycetes
Agaricales
Agaricaceae
Cyathus
Cyathus prismaticus

description: Cyathus prismaticus Z.Y. Duan & C.L. Zhao, sp. nov. Figs. 7–10
MycoBank no.: MB 845560
Etymology:— prismaticus (Lat.) referring to the narrow oblique prisms in the peridiole of the specimens.
Holotype:— CHINA. Yunnan Province, Xishan District, Haikou Forest Park, E 102°61′, N 24°79′, on fallen branch of angiosperm, 16 September 2017, CLZhao 2935 (SWFC).
Fruiting body:— infundibuliform, obconical to cupulate, 7–12 mm in height, 4–6 mm in width at the mouth, non-expanding at the mouth and non-tapering towards the base; presence of the emplacement. exoperidium yellowish brown (5E4), shaggy or hirsute, external wall non-striate or only striate at near mouth, covered with pale yellow (4A3), irregular and flexible tufts of hair; hair hyphae with clamp connections, yellowish-brown (5E4), thick-walled (wall up to 0.5–2 μm thick), 1.5–9 µm in diameter. endoperidium silvery brown to dark brown (5E6–7F4), conspicuously striate with 0.3–0.8 mm between the groves. mouth finely fimbriate. peridium walls consist of three different layers: (1) outer wall layer: hyphal system dimitic, CB–, IKI–, tissues unchanged in KOH; generative hyphae with clamp connections, brown, slight thick-walled, frequently branched, 1.5–3.5 µm in diameter; skeletal hyphae colorless to yellowish-brown, thick-walled, unbranched, 1.5–3.5 µm in diameter; (2) inner wall layer: hyphal system dimitic, CB–, IKI–, tissues unchanged in KOH; generative hyphae with clamp connections, rreddish brown, slight thick-walled, frequently branched, 1.5–4.5 µm in diameter; skeletal hyphae reddish brown, thick-walled, unbranched, 2.5–4 µm in diameter;(3) pseudoparenchymatous layer.
Peridioles: — shiny, slightly regular, elliptical-triangular, broadly ellipsoid to ovoid, brownish gray (7F2) to dark grey (8F1), surface irregular, wrinkled, tunica thin, brownish. cortex single-layered, 2–3 × 1.5–2.5 mm. funicular cord present, funiculus hyphae with clamp connections, thick-walled, branched, pale yellowish, 1–3 µm in diameter. hyphal system dimitic, hyphae CB–, IKI–, tissues unchanged in KOH; generative hyphae with clamp connections, colorless, thin-walled, branched, with oil drops inside, 0.5–5 µm in diameter; skeletal hyphae colorless, slight thick-walled, unbranched, with oil drops inside, 1–3 µm in diameter; narrow oblique prisms present.
Basidiospores: — 8.5–20(–20.5) × 7.5–11 µm, L = 15.68 µm, W = 8.77 µm, Q = 1.8 (n = 60/1), subglobose, elliptical to broadly ellipsoid, rarely ovoid, colorless, smooth, thick-walled (up to 0.5–2 μm thick), CB–, IKI–, with inclusions or oil-like globule, without apiculus. Basidia not observed.
description: Published as part of Duan, Zi-Yan, Yang, Xin, Liu, Chao-Mao & Zhao, Chang-Lin, 2023, Morphological characteristics and phylogenetic analyses revealed two additional taxa in Cyathus (Agaricales, Basidiomycota), pp. 1-20 in Phytotaxa 598 (1) on pages 11-14, DOI: 10.11646/phytotaxa.598.1.1, http://zenodo.org/record/7958744