SPORANGIA: total height 0.6 to 1.5 mm., gregarious or united in small clusters, often connate, globose or irregular in shape, stalked, usually erect, about 0.5 mm. diam., white; sporangial wall membranous, with crowded clusters of included lime-granules.

STALK: white, buff, or reddish, sometimes darker toward the base, 0.1 to 1 mm. long, often tapering upward, nearly smooth, brittle and chalky in cross-section.

COLUMELLA: conical.

CAPILLITIUM: persistent, retaining the form of the sporangium after dispersal of the spores, forming a close network of hyaline threads with numerous, fusiform or rounded, white lime nodes, occasionally angular and branching.