| The columella reduced to a thin alutaceous layer of granules of lime, forming the base of the plasmodiocarp. |
| 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. |
| Sporangia always sessile, simple and regular or plasmodiocarp, sometimes united into an thalium. |
| Distinguished from Perichna by the terete plasmodiocarp and by the more spinulose capillitium. |
| The columella a thin alutaceous, granulose-roughened layer, extending along the base of the plasmodiocarp. |
