Perenniporia eugeissonae P. Du & Chao G. Wang, 2020

Perenniporia eugeissonae P. Du & Chao G. Wang View in CoL , sp. nov. ( Figs. 2 View FIGURE 2 , 3 View FIGURE 3 )

MycoBank:—MB 835217

Type:— MALAYSIA, Selangor, Kota Damansara, Community Forest Reserve, on dead Eugeissona tristis ( Arecaceae ), 16 April 2018, Y. C. Dai 18600 ( BJFC 026888).

Etymology:— Eugeissonae (Lat.) refers to Eugeissona tristis ( Arecaceae ), the host of the species.

Diagnosis:—Differs from other Perenniporia species by the combination of resupinate basidiocarps, strongly flexuous, dextrinoid skeletal hyphae, presence of dendrohyphidia at dissepiments, ellipsoid not truncate basidiospores measuring 5.2–6.2 × 4.2–5 μm, and growing exclusively on Eugeissona tristis in tropical Asia.

Description: —Basidiocarps annual, resupinate, coriaceous to soft corky, without odour or taste when fresh, corky upon drying, up to 15 cm long, 4 cm wide and 1.2 mm thick at centre. Pore surface white when fresh, cream to pale straw-coloured upon drying. Sterile margin very narrow to inconspicuous; pores circular, 6–8 per mm; dissepiments thick, entire. Subiculum cream, hard corky, very thin to almost lacking, up to 0.1 mm thick. Tubes concolorous with pore surface, up to 1.1 mm long. Hyphal structure dimitic; generative hyphae bearing clamp connections; skeletal hyphae dextrinoid, CB +, swollen in KOH. Subiculum generative hyphae infrequent, hyaline, thin-walled, occasionally branched, 1.5–2.2 µm in diam; skeletal hyphae dominant, hyaline to pale brownish, thick-walled with a narrow to wide lumen, occasionally branched, strongly flexuous, interwoven, 1.5–2.8 µm in diam. Tubes generative hyphae infrequent, hyaline, thin-walled, frequently branched, 1.8–2.1 µm in diam; skeletal hyphae dominant, hyaline to pale brownish, thick-walled with a narrow to wide lumen, occasionally branched, strongly flexuous, interwoven, 1.8–2.5 µm in diam; dendrohyphidia frequently present at dissepiment edges; cystidia absent, cystidioles frequently present, fusoid, thin-walled, hyaline, 13–17 × 4–6 μm; basidia barrel- to pear-shaped, with four sterigmata and a basal clamp connection, 15–19 × 7.5–9 μm; basidioles in shape similar to basidia, but distinctly smaller than basidia.

Basidiospores ellipsoid, not truncate, hyaline, thick-walled, smooth, strongly dextrinoid, CB +, (5.1–)5.2–6.2(– 6.5) × (4–)4.2–5(–5.1) μm, L = 5.6 μm, W = 4.7 μm, Q = 1.19–1.21 (n = 90/3).

Type of rot:—Causing a white rot.

Additional specimens (paratypes) examined: — MALAYSIA. Selangor, Kota Damansara, Community Forest Reserve, on dead Eugeissona tristis , 16 April 2018, Y. C. Dai 18581 ( BJFC 026869), Y. C. Dai 18590 ( BJFC 026878), Y. C. Dai 18605 ( BJFC 026893) and Y. C. Dai 18613 ( BJFC 026902).