Psathyrella piluliformoides 2021

Psathyrella piluliformoides T. Bau & J.Q. Yan, sp. Nov.2021

MycoBank No: 838375

Holotype: China. Kunming Institute of Botany, Kunming City, Yunnan Province, 9 September 2017, Herbarium of Mycology, Jilin Agricultural University (HM JAU37923).

Morphological description

Sexual morph: Pileus 50–60 mm broad, plane, hygrophanous, brown at centre, pale at margin, smooth, striations indistinct at margin. Context thin and frag ile, approximately 2.0 mm at the centre, same colour as pileus. Lamellae approxi mately 4.0 mm, very closed, pale coffee, edges paler and even. Stipe 5.5 mm long, 5.0 mm thick, fragile, cylindrical, hollow, slightly thickened towards base, white at apex, base slightly brown, with white evanescent squama. Ring present at 1/3 from stipe apex.

    Spores 5.6–6.3 × 3.1–4.4 μm, Q = 1.3–1.9, ellipsoid to oblong-ellipsoid, in pro f ile flattened on one side, pale brown in water, dirty brown in 5% KOH, inamyloid, smooth, germ pore distinct, truncate, 1.1–1.9 μm broad. Basidia 15–18 × 4.9–6.1 μm, clavate, hyaline, 4- or 2-spored. Pleurocystidia 39–54 × 11–15 μm, abundant, utri form to narrowly utriform, or lageniform, rarely fusiform, thick-walled or thin-walled, apex obtuse or broadly obtuse, covered by yellow amorphous incrustation, dissolving in 5% KOH. Cheilocystidia scattered, 24–37 × 9.8–15 μm, utriform, thick-walled or thin-walled, apex obtuse or broadly obtuse, mixed with subglobose to spherope dunculate cells, cells 11–16 × 9.8–14 μm, slightly thick-walled or not. Trama of gills irregular. Pileipellis consisting of a 2–3-cell-deep layer of subglobose cells 34–40 μm broad. Clamps present.

Asexual morph: Undetermined

Culture characteristics:

Habitat: Solitary on moss.

Distribution: China

GenBank Accession: ITS MW405106; LSU MW413362; tef-1α MW411002; β-Tub -

Notes:

Reference: [1] Bau, T. , &  Yan, J. Q. . (2021). A new genus and four new species in the /psathyrella s.l. clade from china. MycoKeys, 80, 115-131.

Figure 2. Basidiomata g, h Psathyrella piluliformoides (HMJAU37923). Scale bars: 10 mm

Figure 5. Psathyrella piluliformoides (HMJAU37923) a basidiomata b basidiospores c basidia d pileipel lis e pleurocystidia f cheilocystidia. Scale bars: 10 mm (a); 10 μm (b–f).