The cell walls are relatively thin near the top. The lower and older parts of the stem, as well as older branches, each produce a descending rhizoid that can branch and feature annular constrictions. The cells at the apex are cylindrical with slightly rounded or tapered ends. The basal stem cells are somewhat club-shaped, and they may extend into a rhizoid. These plants are of a dark to brownish-green color, growing upright and forming dense clusters. They are firmly anchored by a tangled rhizoidal holdfast. These plants lack septation and instead have annular constrictions and branched tips originating from the main stem cells, forming a stem with branches emerging from nearly every cell.