Leucogyrophana mollusca

General: Completely resupinate basidioma developing on decaying conifer wood (especially pine), with a merulioid hymenophore composed of irregular, folded-wrinkled orange ridges and a whitish growing margin.

Hyphal system: Monomitic, composed of smooth, hyaline, thin-walled generative hyphae; subhymenial hyphae 3-4 µm wide; subicular hyphae 4-6 µm wide, interwoven, branched, separated by gelatinization, septate with clamp connections.

Cystidia: Absent.

Basidia: Clavate, 18-25 x 5-6 µm, with basal clamp connections, 4-spored.

Spores: Ellipsoid, smooth, hyaline, moderately thick-walled, 5-6.5 x 3.5-4.5 µm, with an eccentric apiculus, granular content, dextrinoid in Melzer's reagent.

Notes: Closely allied to Leucogyrophana pseudomollusca, which differs by larger basidia (30-40 µm long) and larger spores (6-9 µm long).