Might be involved in the organization and polarity of the actin cytoskeleton. Interacts with the barbed end of actin filaments and nucleates actin-filament polymerization in vitro. Seems to play a role in cytokinesis. Expressed in the endosperm. Localizes to the cell plate, a plant-specific membranous component that is assembled at the plane of cell division. Belongs to the formin-like family. Class-I subfamily.