Calocybe cystidiosa A. Ma, J.J. Hu, B. Zhang & Y. Li

Ma, Ao, Hu, Jia-Jun, Chen, Yue-Qu, Wang, Xin, Tuo, Yong-Lan, Yue, Lei, Li, Xue-Fei, Dai, Dan, Wei, Yun-Hui, Zhang, Bo & Li, Yu, 2024, Multiple evidence reveals two new species and new distributions of Calocybe species (Lyophyllaceae) from northeastern China, MycoKeys 103, pp. 37-55 : 37

Calocybe cystidiosa A. Ma, J.J. Hu, B. Zhang & Y. Li

Figs 4C , 5

Etymology.

“cystidiosa” refers to the presence of cheilocystidia.

Diagnosis.

This species is differentiated from other species by its fresh-pink basidiomata, uncurved margin of the pileus, whitish pink stipe covered with tomentose at the base, lager basidiospores, and the presence of cheilocystidia.

Type.

China. Liaoning Province, Fushun City, Xinbin Manchu Autonomous County, Gangshan Provincial Forest Park , Fushun City , August 28, 2018, Ao Ma, HMJAU48268 .

Description.

Basidiomata solitary to gregarious, small to medium. Pileus 1.8-3.7 cm diameter, convex when young, plane and umbonatus when mature, smooth, dull, flesh-pink (7B4), entire; margin entire, inrolled to incurved. Lamellae white (7A1) to cream (30A2), subdecurrent, adnate, crowded, with a serious lamellulae. Stipe 2.8-4.5 cm long and 0.3-0.6 cm wide, central, paler pink (7B3) to pink (7B44), white (7A1) at apex, solid when younger, then becoming hollow, cylindrical, smooth, fibrous, slightly enlarged towards the base, with white tomentose at base. Context white (7A1), thin, odorless, tastes mild and not distinctive.

Basidiospores (4.0)5.0-6.5(6.9) × (2.0)2.1-2.5 μm, Q = (2.00)2.27-3.00(3.10), Qm = 2.58, hyaline, oval, smooth, inamyloid, thin-walled. Basidia 22.0-28.0 × 5.0-7.0 μm, clavate to cylindrical, 2- or 4-spored, hyaline, thin-walled. Hymenophoral trama regular and hyphae arranged parallel, not pigmented. Cheilocystidia 13.0-20.0 × 3.0-6.0 μm, clavate with an umbo occasionally, or bifurcated, hyaline, thin-walled. Pileipellis hyphae wide 5.0-12.0 μm diameter, smooth, hyaline, thin-walled. Stipitipellis hyphae 3.8-9.0 μm diameter, hyaline, thin-walled. Clamp connections present.

Additional specimens examined.

China. Liaoning Province, Fushun City, Xinbin Manchu Autonomous County, Gangshan Provincial Forest Park , Fushun City , 23 June 2018, Ao Ma, HMJAU48269 .

Habitat.

Grows on the leaf litter in coniferous forests.

Comments.

This species is characterized by its growth on the leaf litter in coniferous forests, flesh-pink pileus, fibrous stipe covered with white tomentose at the base, non-cellular pileipellis, larger basidiospores, and the presence of cheilocystidia. These characteristics suggest that C. cystidiosa belongs to Sect. Calocybe Carneoviolaceae according to Singer’s opinion ( Singer 1986).

This species is closely related to C. carnea due to its pinkish pileus. However, this species can be distinguished from C. carnea by its unique habitat, deep color of basidiomata, light yellow lamellae, and larger basidiospores. In the Sect. Calocybe Carneoviolaceae , C. vinacea J.Z. Xu & Yu Li is another species recorded from China with pinkish basidiomata. However, C. vinacea differs from this species by the curved margin of pileus, white stipe, smaller basidiospores, and the absence of cystidia ( Xu et al. 2021b).

Figures

Figure 4. Habitat of Calocybe species in this study A Calocybe ionides B Calocybe decolorata C Calocybe cystidiosa D Calocybe betulicola. Scale bars: 1 cm (A-E).

Figure 5. Microcharacteristics of Calocybe cystidiosa A cheiocystidia B basidiospores C basidia D pileipellis. Scale bars: 5 μm (A, B); 10 μm (C, D).