Hymenochaetales » Hymenochaetaceae » Mensularia

Mensularia radiata

Mensularia radiata (Sowerby) Lázaro Ibiza 1916, in Dai, Y.C., Fungal diversity, 45, 131-343 (2010)

Diagnosis: Fruitbody Basidiocarps annual, pileate, usually in imbricate clusters, soft corky and without special odour or taste when fresh, becoming corky and light-weight upon drying. Pilei dimidiate or semicircular, projecting up to 3 cm, 5 cm wide and 8 mm thick at base. Pileal surface yellowish brown, reddish brown to dark brown, finely velutinate to glabrous with distinct concentric zones; margin pale yellow to golden yellow, acute, curving down when dry. Pore surface umber-brown; sterile margin distinct, up to 2 mm wide; pores angular, 57 per mm; dissepiments thin, distinctly lacerate. Context umber-brown, darker than tubes, hard corky, indistinctly zonate, with a silky sheen, up to 2 mm thick. Tubes greyish brown, distinctly paler than pore surface, corky, up to 6 mm long. Hyphal structure Hyphal system monomitic; generative hyphae simple septate; tissues darkening but otherwise unchanged in KOH. Context Generative hyphae pale yellowish to golden yellow, thin- to slightly thick-walled with a wide lumen, frequently branched and septate, regularly arranged, 3.87.2 μm in diam. Tubes Tramal hyphae hyaline to pale yellowish or golden yellow, thin- to fairly thick-walled with a large lumen, occasionally branched, with frequent simple septa, parallel along the tubes, slightly agglutinated, 2.55 μm in diam. Hymenial setae frequent, hooked, dark brown, thick-walled, sharp-pointed, 1832×812 μm, sometimes the root of a hymenial seta arises deep from trama, resembling hyphoidseta, up to 5080 μm long; basidia subclavate, with four sterigmata and a simple basal septum, 1016×5.57 μm; basidioles in shape similar to basidia, but smaller. Spores Basidiospores ellipsoid, hyaline to pale yellowish, fairly thick-walled, smooth, IKI, Strongly CB+, (3.5–)3.85(–5.2)×(2.5–)2.63.5(–3.8) μm, L=4.27 μm, W=3 μm,Q=1.381.51 (n=120/4).

Index Fungorum Number: IF469833

Notes: Mensularia radiata is characterized by hooked setae and strongly cyanophilous basidiospores. The species is one of the commonest wood-inhabiting polypores in northern China.

Figure 1. Basidiocarps of Mensularia radiata



Figure 2. Microscopic structures of Mensularia radiata. a basidiospores; b setae; c hyphae from trama; d hyphae from context



Dai, Y.C. (2010). Hymenochaetaceae (Basidiomycota) in China. Fungal diversity, 45, 131-343.


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