Spodocybe bispora Z. M. He & Zhu L. Yang, 2021

He, Zheng-Mi & Yang, Zhu L., 2021, A new clitocyboid genus Spodocybe and a new subfamily Cuphophylloideae in the family Hygrophoraceae (Agaricales), MycoKeys 79, pp. 129-148 : 129

Spodocybe bispora Z. M. He & Zhu L. Yang sp. nov. Figs 4C, D , 6

Diagnosis.

Differs from S. rugosiceps in having a nearly smooth pileus, larger basidiospores and 2-spored rather than 4-spored basidia. Differs from C. trulliformis in having a nearly smooth rather than felty-squamulose pileus.

Etymology.

Bispora refers to 2-spored.

Type.

China. Yunnan Province: Baoshan City, Longyang District, Shuizhai Village , at 25.273967°N, 99.306216°E, alt. 2400 m, 12 Aug 2011, J. Qin 324 (KUN-HKAS 73310, holotype) .

Description.

Basidiomes small, clitocyboid. Pileus 1.5-3 cm in diam, plano-convex to funnel-shaped; surface dry and nearly smooth, greyish-brown (4B2-3) to grey-brown (4E3-5); center depressed, usually with a low umbo, somewhat darker; margin generally straight and undulating, incurved when old; context thin and white (1A1). Lamellae deeply decurrent, white (1A1) to cream (1A2), thin, 1-2 mm high, relatively crowded, sometimes forked and intervenose. Stipe 1-3 × 0.2-0.4 cm, central, subcylindrical, hollow; surface dry and nearly smooth, concolorous with pileus; context white (1A1).

Basidiospores [60/3/3] (7)7.5-10.5(11.5) × 3-4 μm, Q = (2.05)2.11-3(3.33), Qm = 2.56 ± 0.3, cylindrical, colorless, hyaline, smooth, thin-walled, inamyloid. Basidia 20-30 × 4-5.5 μm, clavate, 2-spored, colorless, hyaline, thin-walled; sterigmata up to 10 μm long; ratio of basidia to basidiospore length less than 5 (about 2-4). Cystidia absent. Lamellar trama subregular, colorless, hyaline, made up of thin-walled cylindrical hyphae with 3-10 µm wide. Pileipellis a cutis, composed of thin-walled cylindrical hyphae 3-11 µm wide. Stipitipellis a cutis, composed of thin-walled cylindrical hyphae 3-10 μm wide. Clamp connections in all parts of basidiomes.

Habitat, ecology and distribution.

Saprophytic, usually gregarious on the ground of coniferous or coniferous and broad-leaved mixed forest, known from Yunnan, China; July to September.

Additional specimens examined.

China. Yunnan Province: Kunming City, Qipan Mountain , at 26.060020°N, 102.576823°E, alt. 1900 m, 25 Jul 2020, Z. M. He 35 (KUN-HKAS 112564); Nujiang City, Lanping Country, No. 311 Provincial Highway, at 26.636613°N, 99.557809°E, alt. 2660 m, 14 Aug 2011, J. Qin 346 (KUN-HKAS 73332) .

Figures

Figure 4. Basidiomes of described Spodocybe species. A, B Spodocybe rugosiceps (KUN-HKAS 112563, KUN-HKAS 112562, respectively) C, D Spodocybe bispora (KUN-HKAS 73332, KUN-HKAS 112562, respectively). Scale bars: 1 cm.

Figure 6. Microscopic features of Spodocybe bispora (KUN-HKAS 73310, holotype) a basidiospores b basidia c pileipellis. Scale bars: 10 μm.