General Structure and Shape:
Spores of Pithomyces occur individually in air samples. The spores are multicellular and deeply pigmented. Distinctive features are the presence of both transverse and longitudinal divisions called septa; however, the spores of one species lacks the longitudinal septa. The shape of the spores vary from barrel-shaped, to ellipsoid, to club-shaped; they are almost always rounded at the ends with those cells on the end often collapsed. A colorless attachment peg is often visible at the base of the spore.
Range of Textures:
The surface of these spores ranges from smooth, to slightly rough with small pointed projections, to warty with large, wide projections.
Spores of Pithomyces have demonstrated much allergenic activity in several reports, however the details of such activity are unknown.