Hymenogaster citrinus

A widespread hypogeous fungus found year-round.

Outer peridium hyphae filamentous, densely compacted and interwoven, thin- to slightly thick-walled, 4-5 µm wide, with yellowish-brown intracellular pigment.

Inner peridium hyphae of subglobose to polygonal texture, up to 10 µm wide.

Basidia cylindrical, up to 30 µm long and up to 10 µm wide, mostly 2-spored.

Spores citriform, yellowish-brown under the microscope, with a prominent apical papilla and a rugose, verrucose surface covered entirely by distinct darker warts.