Perenniporia rosicola Y.C. Dai, Yuan Yuan & Chao G. Wang, 2024

Wang, Chao-Ge, Chen, Jian, Liu, Hong-Gao, Dai, Yu-Cheng & Yuan, Yuan, 2024, Two new species of Perenniporia sensu lato (Polyporales, Basidiomycota) from China and two new combinations in Crassisporus, MycoKeys 105, pp. 97-118 : 97

Perenniporia rosicola Y.C. Dai, Yuan Yuan & Chao G. Wang sp. nov.

Figs 4 , 5

Holotype.

China. Yunnan Province, Mengla County, Xishuangbanna Rainforest Valley, on branch of Rosaceae , 4.VII.2021, Y.C. Dai 22563 (BJFC037137).

Etymology.

Rosicola (Lat.): refers to the species growing on Rosaceae .

Description.

Basidiomata. Annual, resupinate, soft corky, without odour or taste when fresh, becoming corky when dry, up to 2 cm long, 1.5 cm wide and 1.2 mm thick at centre. Pore surface white when fresh, becoming pale orange brown upon bruising, eventually honey yellow to clay buff upon drying; sterile margin white when fresh, becoming cream upon drying, up to 0.5 mm wide; pores round, sometimes elongated, 5-7 per mm; dissepiments thin, entire to slightly lacerate. Subiculum very thin, cream, corky, up to 0.2 mm thick. Tubes concolorous with pore surface, corky, up to 1 mm long.

Hyphal structure. Hyphal system dimitic; generative hyphae bearing clamp connections; skeletal hyphae dextrinoid, weakly CB+; tissues becoming pale olivaceous in KOH.

Subiculum. Generative hyphae infrequent, hyaline, thin-walled, occasionally branched, straight, 2-2.5 μm in diam.; skeletal hyphae dominant, hyaline, thick-walled with a medium to narrow lumen, frequently arboriform branched, flexuous, interwoven, 1.5-2.5 μm in diam.

Tubes. Generative hyphae infrequent, hyaline, thin-walled, more or less flexuous, 2-2.5 μm in diam.; skeletal hyphae dominant, hyaline, thick-walled with a medium lumen, frequently arboriform branched, flexuous, interwoven, 1.5-2.5 μm in diam. Hymenial cystidia absent; cystidioles present, ventricose to fusiform, hyaline, thin-walled, 14-16 × 5-5.5 μm. Basidia barrel-shaped, with four sterigmata and a basal clamp connection, 16-20 × 7-8 μm; basidioles in shape similar to basidia, but smaller. Irregular crystals present amongst hymenia. Dendrohyphidia present.

Spores. Basidiospores broadly ellipsoid to subglobose, hyaline, thick-walled, smooth, sometimes with a medium guttule, dextrinoid, weakly CB+, 5-5.8(-6) × 4-5.2(-5.3) µm, L = 5.39 μm, W = 4.74 μm, Q = 1.14 (n = 30/1).

Type of rot. White rot.

Notes.

Perenniporia rosicola is characterised by annual and resupinate basidiomata with a white pore surface when fresh, round to sometimes elongated pores of 5-7 per mm, frequently arboriform branched and narrow skeletal hyphae, the presence of dendrohyphidia, broadly ellipsoid to subglobose, thick-walled basidiospores measuring 5-5.8 × 4-5.2 μm and growth on Rosaceae in southwest China.

Figures

Figure 4. Basidiomata of Perenniporia rosicola (Holotype, Y. C. Dai 22563). Scale bar: 1 cm.

Figure 5. Microscopic structures of Perenniporia rosicola (Holotype, Y. C. Dai 22563) a basidiospores b basidia and basidioles c cystidioles d dendrohyphidia e hyphae from subiculum f hyphae from trama.