On the identity and geographical distribution of Ammatoidea normanii W. et G.S. West (Oscillatoriales, Cyanoprokaryota)

The filamentous cyanoprokaryote Ammatoidea normanii W. et G.S. West is a rather uncommon species, recorded from a small number of distant locations around the temperate and cold areas of the world, and only once from Antarctica. This paper contributes to our knowledge of this species through a new Antarctic record, accompanied with morphological observations and a complete description of the environment in which it was found. On this basis, the identity of former probable records from Antarctica and throughout the world is discussed.