Perenniporia punctata Hai J. Li & Jing Si, 2018

Li, Hai-Jiao, Zhou, Meng & Si, Jing, 2018, Perenniporia punctata sp. nov. (Polyporales, Basidiomycota), a new species discovered from China, Phytotaxa 360 (1), pp. 54-60 : 56-59

Perenniporia punctata Hai J. Li & Jing Si , sp. nov. ( Figs. 2 , 3 )

MycoBank: MB 824160

Type.— CHINA. Hubei Prov., Yichang, Wufeng County, Chaibuxi National Forestry Park, on angiosperm stump, 15 August 2017, Dai 17923 (Holotype in BJFC).

Etymology.— Punctata (Lat.) refers to the reduced basidiocarp of the species.

Fruitbody.—Basidiocarps perennial, resupinate, reduced with years, soft corky and without odour or taste when fresh, corky when dry, up to 15 cm long, 6 cm wide and 6.5 mm thick at center. Pore surface cream, buff-yellow to pale yellow when fresh, turn to clay-buff to cinnamon when bruised and left a permanent signet, buff to buff-yellow when dry. Sterile margin very narrow to almost lacking; pores circular, 6–9 per mm; dissepiments thin, entire. Subiculum yellowish brown to cinnamon, corky, very thin to almost absent, up to 0.5 mm thick. Tubes distinctly stratified, corky, up to 6 mm long; old tubes cinnamon to yellowish brown, new tubes cream.

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

Subiculum. —Generative hyphae rare, hyaline, thin- to slightly thick-walled, occasionally branched, 2.8–3.5 μm in diam.; skeletal hyphae dominant, thick-walled, yellowish to yellowish brown, mostly with a narrow lumen to subsolid, occasionally branched, straight to moderately flexuous, interwoven, 3–4.5 μm in diam.

Tubes. —Generative hyphae infrequent, hyaline, thin-walled, branched, 2–3 μm in diam.; skeletal hyphae dominant, thick-walled with a wide to narrow lumen, frequently branched, strongly flexuous, interwoven, 2.2–3.8 μm in diam. Dendrohyphidia, cystidia and cystidioles absent; large cubic to rhombic crystals present among trama; basidia barrelshaped, with four sterigmata and a basal clamp connection, 15–19 × 8–11 μm; basidioles in shape similar to basidia, but smaller.

Spores. —Basidiospores broadly ellipsoid to subglobose, truncate, hyaline, thick-walled, smooth, IKI–, strongly

CB +, (5–)5.5–7(–7.2) × (3.8–)4–6(–7) μm, L = 6.27 μm, W = 5.14 μm, Q = 1.19–1.25 (n = 60/2). Type of rot. —Causing a white rot. Additional specimens examined. — CHINA. Hubei Prov., Yichang, Wufeng County, Chaibuxi National Forestry

Park, on rotten wood of Quercus , 14 August 2017, Dai 17915 ( BJFC) & Dai 17916 ( BJFC).

Figures

FIGURE 2. Basidiocarps of Perenniporia punctata species (Dai 17923 and Dai 17915, scale bars = 2 cm).

FIGURE 3. Microscopic structures of Perenniporia punctata (drawn by Hai-Jiao Li from the holotype). a. Basidiospores. b. Basidia and basidioles. c. Hyphae from trama. d. Hyphae from context.