Diderma sp.

Fruitifications are usually sporangiate, that is the spores are contained within a vessel or receptable.

The peridium (coverings) are usually double, sometimes single or even triple, the outer wall being calcerous or egg-shell like, amorphous or crystalline. The inner layer is membranous, delicate, free or closely applied to the middle or inner wall.

The columella usually conspicuous sometimes reduces to a thickened, intrusive, done like base.

Capillitium is thread-like, branching, anastomosing, limeless and is sometimes replaced by limy columns.

Spores are dark brown to black on mass purplish to violaceous brown by transmitted light.