Guepinia helvelloides

Monomitic hyphal system, with hyaline, thin-walled hyphae, only 1-3 µm wide, widely separated from each other by gelification, septate and clamped.

Basidia ovoid to pyriform, up to 20 µm long and up to 12 µm wide, mature ones with a longitudinal septum, with 2 or 4 long, sinuous sterigmata (2- or 4-spored).

Spores ellipsoidal, flattened on one side, smooth, hyaline, thin-walled, with a lateral apiculus at one end and faint granular internal content.