Perenniporia subrhizomorpha Xue W. Wang, L.W. Zhou & X.M. Tian, 2021

Tian, Xue-Mei, Liu, Shi-Liang, Zhou, Lin-Jiang, Wang, Xue-Wei & Zhou, Li-Wei, 2021, Perenniporia subrhizomorpha sp. nov. (Polyporales, Basidiomycota) from North China, Phytotaxa 528 (2), pp. 125-132 : 129

Perenniporia subrhizomorpha Xue W. Wang, L.W. Zhou & X.M. Tian , sp. nov. ( Figs. 2 & 3 )

MycoBank: MB 841348.

Etymology:— subrhizomorpha (Lat.) , refers to the similarity to Perenniporia rhizomorpha .

Diagnosis:— Perenniporia subrhizomorpha is similar to P. rhizomorpha by having cream-colored rhizomorphs and similar pores (4–6 per mm), but differs in its wider generative hyphae and truncated basidiospores.

Holotype:— CHINA. Hebei Province: Baoding, Laishui County, Yesanpo Bailixia Scenic Spot , on fallen branch of angiosperm, 23 July 2019, Li-Wei Zhou , LWZ 20190723-10 ( HMAS!).

Description:— Basidiomes annual, resupinate, adnate, papery, soft when fresh, becoming corky upon drying. Pore surface white when fresh, cream to buff upon drying; pores angular, 4-6 per mm; dissepiments thin, entire. Sterile margin thinning, white, up to 2 mm wide, usually with white to cream-colored rhizomorphs. Context cream, thin, up to 0.2 mm thick. Tubes concolorous with pore surface, corky, up to 0.6 mm long. Hyphal system dimitic; generative hyphae with clamp connections, slightly cyanophilous; skeletal hyphae cyanophilous; tissue unchanged in KOH. Generative hyphae in context infrequent, difficult to find, hyaline, thin-walled, unbranched, 4–5 μm diam, usually encrusted with crystals; skeletal hyphae in context dominant, hyaline, thick-walled with a distinct lumen, branched, interwoven, 3–4 μm diam. Generative hyphae in trama infrequent, difficult to find, hyaline, thin-walled, unbranched, 3.5–4.5 μm diam; skeletal hyphae in trama dominant, hyaline, thick-walled with a distinct lumen, branched, interwoven, 2–3 μm wide. Dendrohyphidia present at the dissepiments. Cystidia and cystidioles absent. Basidia clavate, with four sterigmata and a basal clamp connection, 17–20 × 9–10 μm; basidioles in shape similar to basidia but slightly smaller. Basidiospores ellipsoid to broadly ellipsoid, truncate, hyaline, thick-walled, smooth, dextrinoid, cyanophilous, (5.6–)5.7–6.5(–7.6) × (4.2–)4.3–5.5(–5.8) μm, L = 6.2 μm, W = 4.8 μm, Q = 1.26–1.29 (n = 60/2).

Additional specimen (paratype) examined:— CHINA. Beijing: Fangshan District, Shangfangshan National Forest Park, on fallen trunk of angiosperm, 22 July 2019, Li-Wei Zhou , LWZ 20190722-36 ( HMAS!) .

Figures

FIGURE 2. Basidiomes of Perenniporia subrhizomorpha. a. LWZ 20190723-10 (holotype); b. LWZ 20190722-36 (paratype). Scale bars: a, b = 1 cm. Photos by: Shi-Liang Liu.

FIGURE 3. Microscopic characters of Perenniporia subrhizomorpha (drawn from the holotype, LWZ 20190723-10). a: Basidiospores. b: Basidia and basidioles. c: Dendrohyphidia. d: Hyphae from trama. e: Hyphae from context. Scale bars: a = 5 µm, b-e = 10 µm. Drawn by: Xue-Wei Wang.