Neofavolus alveolaris

Neofavolus alveolaris (DC.) Sotome & T. Hatt. 2012, in Cui, et al., Fungal Diversity 97, 137–392 (2019)

Diagnosis: Basidiocarps annual, laterally to centrally stipitate, mostly solitary, leathery when fresh, becoming corky upon drying. Pilei fan-shaped, reniform to semicircular, usually circular in centrally stipitate specimens, projecting up to 5 cm, 8.6 wide and 7 mm thick at center. Pileal surface usually fibrillose to squamous with flattened triangular squamules, cream to orange when fresh, buff to reddish-orange when dry, azonate, margin straight when fresh, straight or slightly incurved upon drying. Pore surface cream to buff when fresh, buff to light-brown when dry; pores angular to radially elongated, 1–2 per mm, frequently elongated up to 4 mm long and 2.5 mm wide; dissepiments thin, entire to slightly lacerate. Context white to cream when fresh, buff when dry, up to 3 mm thick. Tubes concolorous with pore surface or slightly paler, decurrent, up to 5 mm long. Stipe concolorous with pileal surface or paler, up to 1 cm long and 8 mm in diam. Hyphal system dimitic; generative hyphae bearing clamp connections; skeletal hyphae IKI–, CB+; tissues unchanged in KOH. Generative hyphae frequent, hyaline, thin-walled, frequently branched, 2.5–5.5 µm in diam; skeletal hyphae dominant, hyaline, slightly thick-walled with a wide lumen in juvenile specimens and thick-walled with a narrow lumen to subsolid when mature, moderately branched, interwoven, 2–6 µm in diam. Hyphae in squamules thin-walled bearing clamp connections, with buff inclusion, 3–7.5 µm in diam. Generative hyphae frequent, hyaline, thin-walled, frequently branched, 2–4.3 µm in diam; skeletal hyphae dominant, hyaline, slightly thick-walled with a wide lumen in juvenile specimens and thick-walled with a narrow lumen to subsolid when mature, moderately branched, interwoven, 2–5.5 µm in diam. Cystidia and cystidioles absent. Basidia clavate, with four sterigmata and a basal clamp connection, 16.5–32.3 × 6.5–8.5 µm; basidioles in shape similar to basidia, but slightly smaller. Generative hyphae frequent, hyaline, thin-walled, frequently branched, 2–5.5 µm in diam; skeletal hyphae dominant, hyaline, slightly thick-walled with a wide lumen in juvenile specimens and thick-walled with a narrow lumen to subsolid when mature, moderately branched, interwoven, 1.5–6.6 µm in diam.

Index Fungorum Number:  IF801928

Notes: Neofavolus alveolaris has variable size of basidiospores and variable color of pileal surface in different specimens. Its fibrillose to squamous basidiocarps is different from other Neofavolus species.