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

Bau, Tolgor & Yan, Jun-Qing, 2021, A new genus and four new species in the / Psathyrella s. l. clade from China, MycoKeys 80, pp. 115-131 : 115

Psathyrella piluliformoides T. Bau & J.Q. Yan sp. nov. Figs 2g, h , 5

Etymology.

Reference to its characteristics similar to Psathyrella piluliformis .

Type.

China. Kunming Institute of Botany, Kunming City, Yunnan Province, 9 September 2017, Herbarium of Mycology , Jilin Agricultural University (HMJAU37923) .

Diagnosis.

Differs from Psathyrella piluliformis by having ring and yellow amorphous incrustation at the apex of pleurocystidia.

Pileus 50-60 mm broad, plane, hygrophanous, brown (7C7-7D7) at centre, pale (6B6-6B7) at margin, smooth, striations indistinct at margin. Context thin and fragile, approximately 2.0 mm at the centre, same colour as pileus. Lamellae approximately 4.0 mm, very closed, pale coffee (6C5-6D5), edges paler and even (6B4). Stipe 5.5 mm long, 5.0 mm thick, fragile, cylindrical, hollow, slightly thickened towards base, white (6A1) 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 profile 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, utriform 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 spheropedunculate 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.

Habit and habitat.

Solitary on moss.

Figures

Figure 2. Basidiomata a-c Heteropsathyrella macrocystidia (HMJAU 37802) d-f Psathyrella amygdalinospora (HMJAU 37952) g, h P. piluliformoides (HMJAU 37923) i P. truncatisporoides (HMJAU 37947). Scale bars: 10 mm (a-i).

Figure 5. Psathyrella piluliformoides (HMJAU 37923) a basidiomata b basidiospores c basidia d pileipellis e pleurocystidia f cheilocystidia. Scale bars: 10 mm (a); 10 μm (b-f).