Psathyrella amygdalinospora 2021

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

MycoBank No: 838374

Holotype: China. Scenic Spot of Kangding Love Song (Mugecuo), Kangding City, Tibetan Autonomous Prefecture of Garzê, Sichuan Province, 30°08'49.19"N, 101°51'39.18"E, 3790 m, 21 August 2017, Jun-Qing Yan, Herbarium of Mycology, Jilin Agricultural University (HMJAU37952).

Morphological description

Sexual morph: Pileus 15–25 mm broad, paraboloid, hygrophanous, chestnut, becom ing dirty white as pileus dries. Veil not observed. Context approximately 2.0 mm at the centre, fragile, concolorous with pileus. Lamellae 4.0 mm, light brown, edges white, even. Stipes 45–60 mm long, 2.5–3.0 mm thick, fragile, hollow, cylindrical, equal or slightly expanded at base, dirty white. Odour and taste indistinctive.

    Spores 8.8–9.7 × 4.9–5.8 μm, Q = 1.5–1.9, ovoid in front view, amygdaliform in profile, reddish brown in water, dark brown and gradually becoming black-brown in 5% KOH, inamyloid, smooth, germ pore absent. Basidia 17–20 × 7.3–9.8 μm, clavate, hya line, 4-spored. Pleurocystidia abundant, 44–68 × 9.8–13 μm, fusiform to narrowly utri form, thin-walled, apex obtuse to subacute, rarely subcapitate. Pleurocystidioid cheilo cystidia abundant, 22–32 × 7.3–12 μm, fusiform to utriform, short mucronate or obtuse at apex, rarely mixed with pyriform cells. Trama of gills irregular. Pileipellis consisting of a 1–2-cell-deep layer of subglobose cells that were 30–40 μm broad. Clamps present.

Asexual morph: Undetermined

Culture characteristics:

Habitat: Scattered on mosses in mixed forests of Cunninghamia spp., Pinus spp. and Quercus semecarpifolia.

Distribution: China

GenBank Accession: ITS MW405104; LSU MW413361; tef-1α MW410999; β-Tub MW410991

ITS MW405105; 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 d–f Psathyrella amygdalinos pora (HMJAU37952). Scale bars: 10 mm

Figure 4. Psathyrella amygdalinospora (HMJAU37952) a basidiomata b basidiospores c basidia d pileipel lis e pleurocystidia f cheilocystidia. Scale bars: 10 mm (a); 10 μm (b–f).