Abstract
A taxonomic survey of the macroalgae and cyanobacteria associated with pneumatophores of the mangrove Avicennia marina in Shark Bay, Western Australia, recorded 51 species, comprising 7 Cyanobacteria (blue-green algae), 14 Chlorophyta (green algae), 3 Phaeophyceae (brown algae) and 27 Rhodophyta (red algae). Of these, 31 represent new records for Shark Bay, and the red algae Gelidium minisculum, Bostrychiocolax australis (a parasite on Bostrychia radicans), and Dasya kristeniae are newly recorded for Western Australia.