Sirodotia (Batrachospermales, Rhodophyta) in Australia and New Zealand

Two species of Sirodotia from Australia and New Zealand are documented, inc luding descriptions, photomicrographs, maps and keys. Sirodotia goebelii sp . nov., known only from a single nineteenth century collection from south-w estern Western Australia, has carpogonia with a broad base and usually pedi cellate and deflexed trichogyne, long and profusely branched erect gonimobl asat filaments, and longer, elongate carposporangia. Sirodotia suecica Kyli n is widespread in Australia and New Zealand, including a number of notewor thy variants. All other species of Sirodotia reported from the region are r eferred to S. suecica.