This is a subpinnately branched leafy liverwort that can be greenish or brownish in colour with shoots 0.7 to 1.5 mm wide. The leaves are up to 1 mm wide by 1.2 mm long with rounded lobes and large helmet shaped lobules of equal width and length. The underleaves are dioicious and often fertile. Female shoots have warty perianths whereas the male equivalents appear narrow by comparison.

On well lit trees and shrubs, especially ash, willow and poplar. Occasionally on rock or in turf.

All year.

Very common.

Common, particularly in the Charnwood area.