Plants erect to decumbent pseudodichotomously branched. Thalli attached mainly by discoid holdfasts, but decumbent axes producing secondary discoid holdfast or rhizoids at the tips of branches. Rhizoids cut off from the pericentral cells. Pericentral cells 9–11. Axis ecorticated to heavily corticated near the base of large plants. Trichoblasts absent. Branching exogenous; occasionally, decumbent axes produce endogenous branches.