Polyporales » Polyporaceae » Melanoderma

Melanoderma microcarpum

Melanoderma microcarpum B.K. Cui & Y.C. Dai 2011, in Cui, et al., Fungal Diversity 97, 137392 (2019)

Diagnosis: Basidiocarps perennial, pileate to effuse-reflexed, narrowly attached, woody hard upon drying, without odor or taste. Pilei circular to irregularly shaped, projecting up to 1.6 cm, 1.5 cm broad and 5 mm thick at base. Pileal surface dark reddish brown to blackish brown, concentrically zonate, glabrous; margin obtuse, cream-buff when juvenile, becoming black when mature. Pore surface white when fresh, cream to cream-buff when dry; pores distinctly circular, 79 per mm; dissepiments thick, entire. Context cream-buff, woody hard, up to 1 mm thick, upper surface with a blackish crust. Tubes cream-buff, woody hard, stratified, about 1 mm long in each layer. Hyphal system dimitic; generative hyphae bearing clamp connections; skeletal hyphae dextrinoid, CB+; tissues unchanged in KOH. Generative hyphae infrequent, hyaline, thin-walled, rarely branched, 1.53.6 µm in diam; skeletal hyphae dominant, hyaline, thick-walled to subsolid, often branched, interwoven, 1.55.7 µm in diam. Generative hyphae infrequent, hyaline, thin-walled, unbranched, 1.23 µm in diam; skeletal hyphae dominant, thick-walled to subsolid, usually branched, strongly interwoven, 1.25 µm in diam. Cystidia clavate to ventricose, hyaline, thin-walled, usually apically encrusted, 2032 × 4.87.6 µm; cystidioles clavate, hyaline, thin-walled, 17.624 × 46.2 µm. Basidia clavate, with four sterigmata and a basal clamp connection, 9.816 × 56.5 µm; basidioles similar in shape to basidia, but slightly smaller. Rhomboid crystals frequently present in trama and hymenium. Basidiospores cylindrical, hyaline, thin-walled, smooth, IKI, CB, (5–)5.16.4(–7.2) × (1.8–)1.92.7(–3) µm, L = 5.92 µm, W = 2.28 µm, Q = 2.252.79 (n = 90/3).

Index Fungorum NumberIF519873

Notes: Notes. — Melanoderma microcarpum is characterized by a perennial growth habit, pileate to effuse-reflexed basidiocarps with a distinct blackish crust at pileal surface, small and round pores, dimitic hyphal system with clamped generative hyphae, dextrinoid and cyanophilous skeletal hyphae, cylindrical, thin-walled basidiospores, negative in Melzers reagent and Cotton Blue, and presence of apically encrusted cystidia (Cui et al. 2011).