Psathyrella jilinensis T. Bau & J.Q. Yan

Yan, Jun-Qing & Bau, Tolgor, 2018, The Northeast Chinese species of Psathyrella (Agaricales, Psathyrellaceae), MycoKeys 33, pp. 85-102 : 88-90

Psathyrella jilinensis T. Bau & J.Q. Yan sp. nov. Figs 2 c–e, 4

Diagnosis.

Pileus paraboloid to convex, margin at first appendiculate with adhering patches of white evanescent inner veil. Lamellae 2.0-5.0 mm broad, moderately close. Basidiospores (5.8 –)6.3–7.3(– 7.8) × (2.9 –)3.4– 4.4 μm, germ pore absent or indistinct. Pleurocystidia fusiform to narrowly fusiform. Cheilocystidia similar to pleurocystidia. Cheilocystidia and pleurocystidia covered by hyaline, hemispherical amorphous incrustation at apex.

Holotype.

CHINA. Jilin Province: Changbai Mountain, Antu County, Yanbian Korean Autonomous Prefecture, 42°23'51"N, 126°05'47"E, 760 m alt., 7 Jul 2015, HMJAU 37822.

Etymology.

Name refers to the type locality where the new species was collected.

Description.

Pileus 17-45 mm, paraboloid to convex, hygrophanous, reddish-brown (8E5-8E6) at centre, pale yellowish-brown (7C6-7D7) at margin in early stage, yellowish-brown (6B5-6C5), striate up to 1/2 from margin at maturity, becoming slightly brown (7C5-7D6) as pileus dries. Veil white (6A1), thin, fibrillose, at first as appendiculate inner veil or adhering patches at pileus margin, evanescent. Context white (6A1), thin, very fragile, about 2.0 mm thick at centre. Lamellae 2.0-5.0 mm broad, moderately close, adnate, greyish to greyish-brown (7C1-7C3); edges saw-toothed under 20 × magnification. Stipe 40-50 × 3.0-7.0 mm, white (6A1), cylindrical, hollow, surface covered with slight white (6A1) evanescent fibrils. Odour and taste indistinctive.

Basidiospores (5.8 –)6.3–7.3(– 7.8) × (2.9 –)3.4– 4.4 μm, Q= (1.4 –)1.8–2.0(– 2.3), oblong-ellipsoid, in profile flattened on one side, pale brown in water, brown in 5% KOH, gradually becoming greyish-brown, inamyloid, smooth, germ pore absent or indistinct, about 0.9 μm wide (if it can be observed). Basidia 15-17 × 6.0-7.0 μm, clavate, hyaline, 4 or 2-spored. Pleurocystidia fusiform, narrowly fusiform, rarely narrowly utriform, thin-walled or slightly thick-walled, apex obtuse to subacute, hyaline, covered by hyaline, hemispherical amorphous incrustation, which can dissolve in 5% KOH. Cheilocystidia 37-51 × 8.5-12 μm, similar to pleurocystidia, hyaline, covered with amorphous incrustation at apex. Trama of gills parallel to hyphae, up to 15 μm broad. Pileipellis consisting of 2-3 cells deep layer of subglobose cell, 20-30 μm broad. Veil composed of cylindrical hyphae, 8.5-10 μm broad. Clamps present.

Habit and habitat.

Solitary to scattered on rotten wood or humus in mixed forests.

Other specimens examined.

Jilin Province, Baishan City, Fusong County, Lushuihe town, 27 Jun 2009, HMJAU 22099; 9 Jul 2015, HMJAU 37823; Yanbian Korean Autonomous Prefecture, Antu County, Changbai Mountain, 23 Jun 2012, HMJAU 25351; 31 Aug 2012, HMJAU 25351; Dayangcha, 6 Jul 2015, HMJAU 37824.