Fuscopostia fragilis

Monomitic hyphal system with thin- to moderately thick-walled context hyphae, 3 to 6 µm wide, hyaline in KOH; tramal hyphae branched, more slender (up to 4 µm wide), thin-walled, with clamped septa.

No cystidia or other sterile structures observed.

Basidia clavate, up to 20 µm long, with basal clamp connections, 4-spored.

Spores cylindrical to allantoid, smooth, hyaline, thin-walled, with a lateral apiculus at one end, vacuolar content, inamyloid in iodine reagents.