Favolaschia imbricata Q.Y. Zhang, L.S. Bian, F. Wu & Y.C. Dai, 2024

Zhang, Qiu-Yue, Liu, Hong-Gao, Li, Wan-Ying, Zhang, Xin, Dai, Yu-Cheng, Wu, Fang & Bian, Lu-Sen, 2024, Three new species of Favolaschia (Mycenaceae, Agaricales) from South China, MycoKeys 104, pp. 71-89 : 71

Favolaschia imbricata Q.Y. Zhang, L.S. Bian, F. Wu & Y.C. Dai sp. nov.

Figs 3A , 4

Type.

China, Guangdong Province, Guangzhou, Baiyun District, Maofengshan Forest Park , dead bamboo, 15 Apr 2023, Dai 24702 (BJFC042256, holotype) .

Etymology.

" imbricata " (Lat.): refers to the species having imbricate basidio-mata.

Macrostructures.

Basidiomata annual, gregarious, gelatinous when fresh and dry. Pilei 2-5 × 1.5-3 mm, conchoid, semicircular to subcircular; pileal surface pale grey to greyish-white (B1) when fresh, dark grey or mouse-grey (1D1-1F1) upon drying, convex with a reticulate pattern matching the pores below, faintly pruinose when dry; margin incurved, entire; context thin. Hymenophore paler than pileal surface, greyish-white (B1) when fresh and ash-grey (1B1-1C1) when dry, poroid, about 22-55 pores per basidiomata; mature pores 0.2-0.6 mm diam., polygonal, larger near the base and smaller near the edge, the marginal pores often incomplete; tubes up to 0.3 mm long. Stipe absent.

Microstructures.

Basidiospores (6.8-)7-9 × 5-6.8 µm, L = 7.92 μm, W = 5.84 μm, Q = 1.31-1.38 (n = 90/3), broadly ellipsoid to subglobose, hyaline, thin-walled, smooth, with some guttules, faintly IKI+, CB-. Basidia 24-30 × 7-13 μm, cylindrical or clavate with some guttules, 4-spored, sterigmata 3-6 μm long; basidioles similar in shape to the basidia, but slightly smaller. Gloeocystidia and acanthocystidia absent. Cheilocystidia 25-39 × 7-14 μm, present at dissepiment edge, cylindrical or clavate, with obtuse diverticulate projections at the apex, thin-walled. Pileipellis hyphae subparallel, smooth to diverticulate, thin-walled, 5-11 µm diam.; terminal cells cystidioid or pyriform, smooth, thin-walled. Tramal hyphae subparallel, widely spaced in a gelatinous matrix, some with dense contents, some collapsed, thin-walled, 2-5 μm diam. Clamp connections present.

Additional specimens examined.

China, Guangdong Province, Guangzhou, Baiyun District, Maofengshan Forest Park , dead bamboo, 15 Apr 2023, Dai 24703 (BJFC042257, paratype), Dai 24704 (BJFC042258, paratype) .

Distribution and ecology.

Favolaschia imbricata is distributed in subtropical area of Guangdong Province, China; it grows on dead bamboo and causes a white rot.

Figures

Figure 3. Dry basidiomata of Favolaschia species A Favolaschia imbricata B Favolaschia miscanthi C, D Favolaschia sinarundinariae. Scale bars: 1 mm.

Figure 4. Basidiomata and microscopic structures of Favolaschia imbricata A, B basidiomata (Dai 24702, holotype) C basidiospores D hymenium in trama E basidia and basidioles F tramal hyphae G cheilocystidia at dissepiment edge H hyphae of pileipellis. Scale bars: 5 mm (A, B); 10 µm (C-H).