Gloeophyllum trabeum

Dimitic hyphal system, with skeletal hyphae thick-walled, with golden-brown intracellular pigment, up to 6 µm wide, without septa or branches; generative hyphae hyaline, thin-walled, 2.5-4 µm wide, septate and clamped.

Cystidia present in the hymenium, thin-walled, cylindrical to fusiform with an acute tip, up to 30 µm long and narrower than the basidia.

Basidia clavate, up to 25 µm long by 7 µm wide, with basal clamps, 4-spored.

Spores cylindrical, smooth, hyaline, thin-walled, with a lateral apiculus at one end, faint vacuolar internal content, inamyloid in Melzer's reagent.