Sporangia stalked or sessile; capillitium a more or less elastic network of branching threads, thickened with from two to six continuous, spiral bands, as in the genus Trichia; bands winding in a sinistral direction.

Sporangia subglobose or irregular, sessile or forming plasmodiocarps, rarely short-stalked; sporangial wall usually of two layers, the outer thickened with angular granules which are exceptionally absent in the upper part, the inner usually membranous; capillitiuni of branching or simple, tubular, inelastic threads, spinose, minutely warted, or nearly smooth, usually marked with irregular constrictions; spores yellow or brown, minutely warted.