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

Figs 3C, D , 6

Type.

China, Sichuan Province, Bazhong, Nanjiang County, Micangshan National Forest Park , 25 Sep 2023, dead Sinarundinaria , Dai 26123 (BJFC043673, holotype) .

Etymology.

" sinarundinariae " (Lat.): refers to the species inhabiting dead Sinarundinaria.

Macrostructures.

Basidiomata annual, gregarious, gelatinous when fresh and dry. Pilei 4-7 × 2-5 mm, conchoid to elliptic; pileal surface greyish-white (1B1) when fresh, dark grey (1F1) near the base upon drying, convex, transparent with a reticulate pattern matching the pores below, faintly pruinose when dry; margin straight, crenulate; context thin, opaque. Hymenophore concolorous with pileal surface, poroid, up to 80 pores per basidiomata; mature pores 0.4-1 mm diam., polygonal, the size varies irregularly, with some larger near the base or larger near the edges, the marginal pores often incomplete; tubes up to 0.5 mm long. Stipe absent.

Microstructures.

Basidiospores 7-9 × 5-7(-7.5) µm, L = 7.87 μm, W = 6.08 μm, Q = 1.27-1.31 (n = 60/2), broadly ellipsoid to subglobose, hyaline, thin-walled, smooth, with some guttules, faintly IKI+, CB-. Basidia 40-50 × 7-9 μm, narrowly clavate, tapered towards the base, apex broadly rounded, 2 or 4-spored, sterigmata 5-10 μm long; basidioles similar in shape to the basidia, but slightly smaller. Gloeocystidia and acanthocystidia absent. Cheilocystidia 15-32 × 7-10 μm, present at dissepiment edge, antler-shaped or irregular with small diverticulate projections on the sides and at the apex, thin-walled. Pileipellis hyphae interwoven, with frequent diverticulate, thin-walled, 2-4 µm in diam., swollen to 8 µm on terminal; terminal cells irregular, with obtuse diverticulate projections at the apex, orientated perpendicular to pileal surface. Tramal hyphae interwoven, widely spaced in a gelatinous matrix, some with dense contents, some collapsed, thin-walled, 1.5-3 μm in diam. Clamp connections present.

Additional specimens examined.

China, Sichuan Province, Bazhong, Nanjiang County, Micangshan National Forest Park, 25 Sep 2023, dead Sinarundinaria , Dai 26129 (BJFC043679, paratype) , Dai 26130 (BJFC, paratype) , Dai 26134 (BJFC, paratype) , Dai 26136 (BJFC, paratype) , Dai 26142 (BJFC043692, paratype) ; Leshan, Ebian County, Heizhugou , 11 Aug 2023, dead Sinarundinaria , Dai 26115 (BJFC043665, paratype) , Dai 26116 (BJFC043666, paratype) .

Distribution and ecology.

Favolaschia sinarundinariae is distributed in the subtropical area of Sichuan Province, China; it grows on rotten Sinarundinaria and causes 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 6. Basidiomata and microscopic structures of Favolaschia sinarundinariae A, B basidiomata (A Dai 26123, holotype B Dai 26116) C basidiospores D hymenium in trama E basidia and basidioles F tramal hyphae G cheilocystidia at dissepiment edge H hyphae and terminal cells of pileipellis. Scale bars: 1 cm (A, B); 10 µm (C-H).