Australidea is a genus in the family Malmideaceae. It is monospecific, containing a single species, the crustose lichen Australidea canorufescens. The genus was circumscribed by Gintaras Kantvilas, Mats Wedin, and MÃÂ¥ns Svensson in 2021 to contain the species previously known as Lecidea canorufescens. This lichen is widespread in temperate Australia.