Plasmodiocarp very much flattened, longitudinally creeping and reticulate or altogether widely effused; hypothallus none.
The columella a thin alutaceous, granulose-roughened layer, extending along the base of the plasmodiocarp.
Sporangia always sessile, simple and regular or plasmodiocarp, sometimes united into an thalium.
The plasmodiocarp forms very much flattened irregular patches from a few to several millimeters in length or extent.
Sporangia simple and subglobose, or plasmodiocarp, rarely combined into an thalium.
