Psathyrella conica T. Bau & J.Q. Yan

Yan, Jun-Qing & Bau, Tolgor, 2018, The Northeast Chinese species of Psathyrella (Agaricales, Psathyrellaceae), MycoKeys 33, pp. 85-102 : 87-88

Psathyrella conica T. Bau & J.Q. Yan sp. nov. Figs 2 a–b, 3

Diagnosis.

Pileus campanulate to conical, with a subacute to obtuse umbo in early stage. Lamellae 3.0-5.0 mm broad, close. Basidiospores 7.8-8.8 × 4.0 –4.5(– 5.0) μm, germ pore indistinct or absent. Pleurocystidia numerous, narrowly utriform, with obtuse to broad obtuse or slightly subcapitate at apex. Cheilocystidia scattered.

Holotype.

CHINA. Jilin Province, Yanbian Korean Autonomous Prefecture, Antu County, Changbai Mountain, 30 Jun 2017, HMJAU 37846.

Etymology.

Name refers to the conical pileus.

Description.

Pileus 12-45 mm, campanulate to conical, with a subacute to obtuse umbo in early stage, hygrophanous, chestnut (7D4-7D6), becoming dirty white with slightly yellowish-brown (6C5-6C6) as drying, striate indistinctly. Veil with a thin coating of white to dirty white (6A1-6B1) fibrils, evanescent. Context dirty white with slightly pink (6B4-6B5), about 3.0 mm thick at stipe centre. Lamellae 3.0-5.0 mm broad, close, adnate to slightly adnexed, coffee-cream (6C4-6C6); edges white (6A1), saw-toothed under 20 × magnifier. Stipe 34-85 × 2.0-7.0 mm, cylindrical, slightly expanded or not at base, white, with slightly brown at base, hollow, equal, surface covered with white (6A1) fibrils in early stage, evanescent. Odour and taste indistinctive.

Basidiospores 7.8-8.8 × 4.0 –4.5(– 5.0) μm, Q=1.8 –2.1(– 2.3), oblong-ellipsoid to oblong, in profile slightly flattened on one side, pale yellowish-brown in water, yellowish-brown to brown in 5% potassium hydroxide (KOH), inamyloid, smooth, with 1-2 guttulate, germ pore indistinct or absent. Basidia 20-25 × 7.3-9.8 μm, clavate, hyaline, 4- or 2-spored. Pleurocystidia 43-61 × (8.5 –)9.8– 12 μm, numerous, narrowly utriform, thin-walled, hyaline, with obtuse to broad obtuse or slightly subcapitate, sometimes adhering subhyaline deposits. Cheilocystidia scattered, similar to pleurocystidia, 24-39 × 8.5-12 μm; spheropedunculate or clavate cells abundant, 20-29 × 12 -18 μm. Trama of gills irregular, up to 20 μm broad. Pileipellis consisting of 2-3 cells deep layer of subglobose cell, 25-37 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, 7 Jul 2004, HMJAU 4969; 29 Jun 2005, HMJAU 4923; 25 Jun 2009, HMJAU 22096; Yanbian Korean Autonomous Prefecture, Antu County, Changbai Mountain, 23 Jun 2012, HMJAU 25342; 4 Jul 2015, HMJAU 37826; 29 Jun 2017, HMJAU 37847, HMJAU 37904; 6 Aug 2017, HMJAU 37905.