Cotylidia fibrae L. Fan & C. Yang, 2021

Yang, Cheng, Xu, Yu-Yan & Fan, Li, 2021, Cotylidia fibrae (Rickenellaceae, Hymenochaetales), a new species from China, Phytotaxa 487 (2), pp. 139-148 : 145-146

Cotylidia fibrae L. Fan & C. Yang , sp. nov. ( Fig. 3 )

MycoBank:—MB838500

Diagnosis:—Pileus surface light grayish yellow at the margin, white towards the centre, with a covering of distinct white fibres, hymenophore covering distinct white fibres. Hymenial cystidia aseptate, more or less cylindrical to clavate, sometimes encrusted apically with crystals. Basidiospores (4.5–) 5–5.5 (–6) × (2.5–) 3–3.5 μm, ellipsoid to oblong, with an obvious apiculus and a large central guttule.

Etymology:—“fibrae”, refers to the fibrous covering of the pileus and hymenophore.

Holotype:— CHINA. Shanxi Province: Linfen City, Yicheng County, Lishan Mountains , on the ground in coniferous forest of Pinus tabuliformis Carr. , 35°29ʹ32ʺN, 111°53ʹ54ʺE, elev. 1911 m, 20 August 2019, collected by Yuyan Xu ( BJTC FM 639 ).

Description:— Basidiomes pileate, fasciculate, infundibuliform to flabelliform, often in groups becoming confluent, stipitate, 1.7–3.5 cm high, 1.5–3 cm wide. Pileus circular, deeply infundibuliform, coriaceous, very thin, pileus surface light grayish yellow (#f5f5dc) at the margin, white (#ffffff) towards the centre, sometimes zonate, covered with distinct white fibres, not pruinose. Stipe short, 1–1.5 cm long, 0.3–0.5 cm wide, central, white (#ffffff) to very pale yellow (#fffff0), tomentose, with white mycelial cords at base. Hymenophore covered with distinct white fibres; flesh very thin, coriaceous. Hyphal system monomitic; generative hyphae without clamps, up to 5 μm wide, hyaline, thin- to thick-walled; hymenial cystidia of tramal origin, 70–115 × 12.5–20 μm, remarkably projecting above the hymenium up to 52 μm, aseptate, more or less cylindrical to clavate, sometimes encrusted apically with crystals. Smell and taste absent.

Basidiospores (4.5–) 5–5.5 (–6) × (2.5–) 3–3.5 μm (x = 5.1 ± 0.31 × 3.0 ± 0.15; Q = 1.42–1.83, Q m = 1.6 ± 0.16) ellipsoid to oblong, with an obvious apiculus, thin-walled, hyaline, smooth, with a large central guttule, inamyloid, non-cyanophilous. Basidia narrowly clavate, 30–38 × 5–6 μm, 4-spored. Clamp connections absent at all septa.

Habitat and distribution:—fasciculate on the ground in coniferous forest with Pinus tabuliformis Carr. and mixed forest of Quercus wutaishansea Mary and P. tabuliformis , Shanxi Province, China.

Additional specimens examined:— CHINA. Shanxi Province: Lvliang city, Xing County, Heicha Mountains, on soil in coniferous forest of P. tabuliformis , 38°13ʹ43ʺN, 111°20ʹ5ʺE, elev. 1680 m, 5 September 2018, collected by Jinzhong Cao (HSA 373). Shanxi Province: Lvliang City, Jiaocheng County, Guandi Mountains, on wood in mixed forest of Q. wutaishansea and P. tabuliformis , 37°51ʹ37ʺN, 111°27ʹ0ʺE, elev. 1880 m, 31 August 2018, collected by Hong Liu (HSA 326).

Figures

FIGURE 3. Cotylidia fibrae. a–b. Basidiomes; c. Basidiospores; d. Hymenial cystidia; e. Basidia. Scale bars: a–b: 10 mm; c: 1 μm; d: 10 μm; e: 5 μm. Photos: a–b by Jinzhong Cao. Drawings: c–e by Cheng Yang.