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

Figs 2 , 3

Holotype.

China. Yunnan Province, Zhaotong, Yiliang County, Xiaocaoba Town, on living tree of Prunus , 2.IV.2023, Dai 24751 (BJFC040388).

Etymology.

Prunicola (Lat.): refers to the species growing on Prunus .

Description.

Basidiomata. Perennial, resupinate, corky, without odour or taste when fresh, becoming hard corky upon drying, up to 15 cm long, 5 cm wide and 16 mm thick at centre. Pore surface clay pink when fresh, becoming cream, buff yellow to fawn upon drying; sterile margin very narrow to almost absent; pores round to slightly elongated, 4-6 per mm; dissepiments slightly thick, entire. Subiculum thin, cream, corky, up to 1 mm thick. Tubes pinkish-buff to clay buff when dry, distinctly stratified, hard corky, up to 15 mm long.

Hyphal structure. Hyphal system trimitic; generative hyphae bearing clamp connections; skeletal and binding hyphae IKI-, weakly CB+; tissues becoming orange brown in KOH.

Subiculum. Generative hyphae frequent, hyaline, thin-walled, occasionally branched, more or less flexuous, 2-4 μm in diam.; skeletal hyphae dominant, hyaline, thick-walled with a wide lumen, occasionally branched, more or less flexuous, 2.5-3 μm in diam.; binding hyphae hyaline, thick-walled with a wide lumen, frequently arboriform branched, flexuous, interwoven, 1.5-2 μm in diam.

Tubes. Generative hyphae infrequent, hyaline, thin-walled, occasionally branched, straight, 2-3 μm in diam.; skeletal hyphae dominant, hyaline, thick-walled with a medium lumen, occasionally branched, slightly flexuous, interwoven, 2-2.5 μm in diam.; binding hyphae hyaline, thick-walled with a medium lumen, frequently arboriform branched, flexuous, interwoven, 1.2-1.5 μm in diam. Hymenial cystidia present, clavate to fusiform, thin-walled, smooth, 25-31 × 5-5.5 µm; cystidioles present, ventricose to fusiform, hyaline, thin-walled, 16-20 × 4.5-5 μm. Basidia clavate, with four sterigmata and a basal clamp connection, 15-22 × 7-8 μm; basidioles more or less pyriform, but smaller. Irregular crystals present among the hymenium.

Spores. Basidiospores ellipsoid to broadly ellipsoid, hyaline, thick-walled, smooth, usually with a medium guttule, dextrinoid, weakly CB+, (4.5-)4.8-6.2(-6.5) × (3.5-)3.6-4.5(-4.9) µm, L = 5.39 μm, W = 4.07 μm, Q = 1.29-1.37 (n = 90/3).

Type of rot. White rot.

Additional specimens examined.

China. Guizhou Province, Zunyi, Suiyang County, Kuankuoshui Nature Reserve , on fallen trunk of Prunus , 7.VII.2022, Y.C. Dai 24280 (BJFC039522) ; Yunnan Province, Zhaotong, Yiliang County, Xiaocaoba , on dead tree of Prunus , 2.IV.2023, Y.C. Dai 24752 (BJFC040389) .

Notes.

Perenniporia prunicola is characterised by perennial and resupinate basidiomata with a clay pink pore surface when fresh, round to slightly elongated pores of 4-6 per mm, a trimitic hyphal system, the presence of clavate to fusiform hymenial cystidia, ellipsoid to broadly ellipsoid and thick-walled basidiospores measuring 4.8-6.2 × 3.6-4.5 µm and growth on Prunus in southwest China.

Figures

Figure 2. Basidiomata of Perenniporia prunicola (Holotype, Y. C. Dai 24751). Scale bar: 1 cm.

Figure 3. Microscopic structures of Perenniporia prunicola (Holotype, Y. C. Dai 24751) a basidiospores b basidia and basidioles c cystidioles d hymenial cystidia e hyphae from subiculum f hyphae from trama.