Agaricales » incertae sedis » Radulomycetopsis

Radulomycetopsis cystidiata

Radulomycetopsis cystidiata Dhingra, Priyanka & J. Kaur, in Dhingra et al., Mycotaxon 119: 133 (2012)

Etymology: The epithet refers to the presence of cystidia

Diagnosis:

Basidiocarp resupinate, adnate, effused, up to 430 µm thick in section, membranous-ceraceous; hymenial surface smooth to slightly tuberculate, orange to brownish orange to reddish brown when fresh, becoming orange gray to grayish orange to brownish orange on drying; margins thinning, irregular in outline, fibrillose.

Basidiospores 6.09.0 × 57.25 µm, broadly ellipsoid to subglobose, thin- to slightly thick-walled, inamyloid, acyanophilous, uniguttulate or with many oil drops Basidia 25.037.0 × 7.08.5 µm, clavate to subclavate, often constricted with oily contents, 4-sterigmate, with no basal clamp; sterigmata up to 7.0 µm long. Cystidia 70.085.0 × 9.011.0 µm, cylindrical to sub cylindrical, thin- to somewhat thick-walled, projecting up to 50 µm out of the hymenium. Some simple to slightly branched hyphoid structures, are also observed in the hymenium. These are thin-walled, with oily contents, and look different from dendrohyphidia. Hyphal system monomitic; generative hyphae up to 3 µm wide, thin-walled, branched at wide angles, septate, without clamps; basal zone composed of sparsely branched hyphae, running almost parallel to the substrate, covered with some brownish-red matter which dissolves in 3% KOH, followed by a zone of comparatively more richly branched, loosely and irregularly interwoven hyphae which merge into the hymenial zone where the hyphae become vertical and much branched forming a dense texture.

Index Fungorum number: IF560518

Notes: Radulomycetopsis cystidiata is similar to Radulomyces confluens, which is easily distinguished by the presence of clamp connections and absence of cystidia.