Perenniporia bostonensis C.L. Zhao, 2018

Shen, Shan, Xu, Tai-Min, Karakehian, Jason & Zhao, Chang-Lin, 2018, Morphological and molecular identification of a new species of Perenniporia (Polyporales, Basidiomycota) in North America, Phytotaxa 351 (1), pp. 63-71 : 67-68

Perenniporia bostonensis C.L. Zhao , sp. nov. ( Figs. 2, 3 )

MycoBank no.: MB 824131

Type.— USA. MA, Boston, Blackstone Park, alt. 52 m, on fallen angiosperm branch, 27 July 2015, CLZhao 144 (holotype, SWFC!)

Etymology.— Bostonensis (Lat.) : referring to the locality (Boston) of the type specimen.

Basidiomata. —Annual, resupinate, without odor or taste when fresh, becoming corky upon drying, up to 5 cm long, 3 cm wide, 2 mm thick at centre. Pore surface cream when fresh, cream to buff upon drying; pores angular, 4–6 per mm; dissepiments thin, entire. Sterile margin wide, grey white to pale brown, up to 1.5 mm wide. Subiculum cream, thin, up to 0.5 mm thick. Tubes cream to buff, corky, up to 1.5 mm long.

Hyphal structure.— Hyphal system dimitic; generative hyphae with clamp connections; skeletal hyphae strong dextrinoid, CB +; tissues unchanged in KOH.

Subiculum. —Generative hyphae infrequent, hyaline, thin-walled, unbranched, 2.5–3.5 μm in diam.; skeletal hyphae dominant, hyaline, thick-walled with a wide lumen, unbranched, interwoven, 3–5 μm in diam.

Tubes. —Generative hyphae infrequent, hyaline, thin-walled, unbranched, 2–3 μm in diam.; skeletal hyphae dominant, hyaline, thick-walled with a wide lumen, unbranched, interwoven, 3–4 μm. Cystidia absent, fusoid cystidioles present, hyaline, thin-walled, 8.5–12 × 2.5–4 μm; basidia barrel-shaped to clavate, with four sterigmata and a basal clamp connection, 11–15 × 7–9.5 μm; basidioles dominant, mostly pear-shaped, but slightly smaller than basidia.

Spores. —Basidiospores ovoid to broad ellipsoid, non-truncate, hyaline, distinct thick-walled, smooth, dextrinoid, CB +, (3.2–)3.5–4.5(–4.7) × (2.8–)3–4(–4.2) μm, L = 3.94 μm, W = 3.42 μm, Q = 1.01–1.13 (n = 180/3).

Additional specimens examined.— USA. MA, Boston, Blackstone Park, alt. 52 m, on fallen angiosperm branch, 27 July 2015, CLZhao 2854, 2855 (paratypes, SWFC!).

Figures

FIGURE 3. Microscopic structures of Perenniporia bostonensis (drawn from the holotype). a. Basidiospores. b. Basidia and basidioles. c. Cystidioles. d. Hyphae from trama. e. Hyphae from subiculum. Bars: a–5 μm; b–e–10 μm.