SUMMARYA small, loose lying, unbranched, filamentous alga from the Ross Sea, Antarctica, is described as a new species,Lola irregularis.The genusLolais closely related to the generaHormiscia, Rhizoclonium,andChaetomorphain the family Cladophoraceae. A key to all known species ofLolais included. This is the first record of a species ofLolasouth of the Antarctic convergence.