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Plasmodiocarpous, white or grey, scattered or gregarious, very thin, rounded or irregular in outline, 1-10 mm wide, 0.1-0.2 mm high. Peridium membranous, white or yellowish, sprinkled, usually scantily, with white, angular or stellate lime crystals. Columella absent, the thickened base giving rise to numerous, erect pillars 7-22 µm thick, enclosing white lime crystals and attached to the upper peridium. Capillitium scanty, often lacking, when present composed of slender, dark, undulating, branched and anastomosed threads attached to the base and peridium. Spore-mass black. Spores 10-12 µm diam., bright violet-brown, minutely and irregularly warted.
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