The type and Australian species of the red algal genera Liagora and Ganonema (Liagoraceae, Nemaliales)

The type and Australian species of the liagoraceous genera Liagora and Ganonema (Rhodophyta: Nemaliales) are described. Twenty-one species are included, comprising 15 of Liagora and six of Ganonema. Five new species, Liagora walkerae, L. kraftii, L. izziae, L. delicatula and Ganonema borowitzkae are described. The new combinations Ganonema pinnatum (Harv.) Huisman, Ganonema samaense (Tseng) Huisman, Ganonema clavatum (Yamada) Huisman and Ganonema megagynum (Borgesen) Huisman are proposed. Liagora cladonioides Borgesen is shown to be a member of the genus Stenopeltis Itono & Yoshizaki. A key to the world's species of Liagora and Ganonema is provided.