Psathyrella truncatisporoides 2021

Psathyrella truncatisporoides T. Bau & J.Q. Yan, sp. nov.2021

MycoBank No: 838378

Holotype: China. Wulingken, Baishanzhu, Qingyuan County, Lishui City, Zhejiang Province, Tolgor Bau, Jun-Qing Yan, 16 August 2015, Herbarium of Mycology, Jilin Agricultural University (HMJAU37947).

Morphological description

Sexual morph: Pileus 8.0–13 mm broad, spreading broadly conical to plane, hygrophanous, pale brown, white at margin, striate up to 2/3 from margin. Veil of a thin coating of white to dirty white fibrils, evanescent. Context thin and very fragile, same colour as pileus, approximately 1.0 mm at centre. Lamellae approximately 1.5 mm broad, pale brown, close, adnate, margin even. Stipes 10–25 mm long, approximately 1.5 mm thick, white, fragile, hollow, smooth but irregularly lumpy, with the base slightly expanding or not. Odour and taste indistinctive.

    Spores (5.8)6.8–7.8(8.3) × 4.4–4.9 μm, Q=1.2–1.8, broadly ellipsoid to ellipsoid, in profile flattened on one side, inamyloid, smooth, apex obviously truncate, germ pore distinct, 1.5–2.4 μm broad. Basidia 13–17 × 6.1–7.3 μm, clavate, 4-spored. Pleurocys tidia 37–49 × 12–16 μm, utriform to broadly utriform, with obtuse to broad apex, base tapering to a long or short stipe, thin-walled. Cheilocystidia 19–31 × 7.3–12 μm, abun dant, similar to pleurocystidia, rarely spheropedunculate, rarely with crystals. Trama of gills irregular. Pileipellis a hymeniderm with 29–39 μm broad cells. Clamps present.

Asexual morph: Undetermined

Culture characteristics:

Habitat: Scattered, terrestrial, in bamboo forest.

Distribution: China

GenBank Accession: ITS MW405107; LSU MW413363; tef-1α MW410998; β-Tub MW410990

ITS MW405108; LSU -; tef-1α -; 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 i Psathyrella truncatisporoides (HMJAU37947). Scale bars: 10 mm 

Figure 6. Psathyrella truncatisporoides (HMJAU37947) a basidiomata b basidiospores c basidia d pileipellis e pleurocystidia f cheilocystidia. Scale bars: 10 mm (a); 10 μm (b–f).