Fruiting body a stalked sporangium. Sporotheca cylindrical. Stalk fibrous, usually shorter than the sporotheca, with a distinct expanded base. Hypothallus discoid or contiguous for a group of sporangia, often inconspicuous. Peridium usually fugacious, rarely persistent. Columella a continuation of the stalk, usually extending to near the apex of the sporotheca. Capillitium arising from the columella along its entire length, consisting of thread-like tubules, these forming a three-dimensional internal network and also sometimes giving rise to a partial surface net. Spores in mass rust-brown to brown or black.
This genus includes several species that were placed in the genera Comatricha and Stemonitis in earlier treatments of the myxomycetes.