Coprinellus pseudodisseminatus T. Bau & M. Huang, 2018

Huang, Mei & Bau, Tolgor, 2018, New findings of Coprinellus species (Psathyrellaceae, Agaricales) in China, Phytotaxa 374 (2), pp. 119-128 : 121-122

Coprinellus pseudodisseminatus T. Bau & M. Huang , sp. nov. ( Figure 1a, 1b )

MycoBank No. MB 825522

Diagnosis:—Pileus small, milky white to pale grey, with radially striate and setules; basidiospores ellipsoid, red-brown; cheilocystidia clavate or lageniform, numerous; caulocystidia and pileocystidia always present.

Etymology:—The prefix Pseudo- means false, and disseminatus means C. disseminatus , is proposed due to its similarity to C. disseminatus .

Type:— CHINA. Jilin Province: Lushuihe National Forest Park, Baishan city, N42°29′23.30″, E127°59′17.56″, 7 August 2017, Tolgor Bau and Mei Huang, HMJAU 46301 (Holotype!). Heilongjiang Province: Liangshui National Nature Reserve, Yichun City, N47°08′27.06″, E128°51′32.06″, 16 July 2016, Qin Na, HMJAU 46303 (Isotype!).

Description:—Pileus 2.– 6 mm broad, subglobose or ellipsoid when young, expanding pileus up to 1.2 mm broad,

milky-white to pale-grey (1A2–1C1) towards margin, pale yellow-brown (3B4) at centre, sometimes almost white

(1A1). Pileus with radially striate and setules. Veil present on pileus, but difficult to find. Context white (1A1), thin.

Lamellae 1–3 mm broad, moderately crowed, adnate, deliquescent, white (1A1) when young, later dark ochre-brown

(8D7). Stipe 7–30 × 0.5–1 mm, cylindrical, hollow, hyaline to white (1A1). Odour and taste indistinctive.

Basidiospores (6.8–)7.1–8.8 (–9.8) × (3.7–)4.2–5.1 (–6.1) μm, Q = 1.5–1.9, on average 7.8 × 4.6 μm, Q av = 1.7, ellipsoid to elongated-ellipsoid, smooth, pale red-brown (9A4) in water, pale olive-green (29C3) in 5% KOH,

germ pore central, 1.2–1.7 μm diam. Basidia 9–37 × 4–8 μm, 4-spored, short clavate and long medially constricted,

hyaline. Cheilocystidia 7–69 × 7–29 μm, lageniform with 14–52 μm long, 3–8 μm wide neck with rounded apex,

clavate 7–29 μm broad, abundant, thin- or thick-walled, hyaline. Pleurocystidia absent. Caulocystidia 24–115 × 4–10 μm, lageniform with 12–81 μm long and 4–10 μm broad neck, rounded apex, mixed with a few small clavate cells, 12–35 × 7–25 μm, thin- or thick-walled and hyaline. Pileocystidia 74–225 × 14–32 μm, lageniform with cylindrical, 53–159 μm long, 7–20 μm wide and rounded apex, usually numerous, thin- or thick-walled and hyaline. Pileipellis hymeniderm, composed by subglobose, 17–47 μm diam., smooth. Veil combined with narrow, branched cells, hyaline. Clamp-connection present.

Habitat:—Scattered or gregarious, on and near wood.

Known distribution:— Jilin Province, Heilongjiang Province, Guangdong Province, Chongqing Municipality, China.

Additional materials examined:— CHINA. Guangdong Province: DingHu Mountain, Zhaoqing City , N23°10′28.60″, E112°32′39.22″, 10 May 2017, Mei Huang, HMJAU 46298 ; Chongqing Municipality: Baihe Forest Park, Fuling District , N29°41′50.16″, E107°22′49.26″, 2 October 2017, Mei Huang, HMJAU 46302 ; Jilin Province: Changbai Mountain, Antu County, Yanbian Korean Autonomous Prefecture , N42°01′12″, E128°04′06″, 6 August 2017, Tolgor Bau and Mei Huang, HMJAU 46300 .

Figures

FIGURE 1a. Basidiomata of Coprinellus pseudodisseminatus. a, b, c. HMJAU 46301; d. HMJAU 46298; e. HMJAU 46303; f. HMJAU 46300. Bars a, b, d–f = 1 cm. Photos a–c, f, by Mei Huang; Photos d, e, by Qin Na.