Beard’s Provinces: Eremaean Province, Northern Province.
IBRA Regions: Carnarvon, Dampierland, Pilbara.
IBRA Subregions: Cape Range, Pindanland, Roebourne.
IMCRA Regions: Abrolhos Islands, Kimberley, Ningaloo, Pilbara (nearshore), Pilbara (offshore), Shark Bay.
Local Government Areas (LGAs): Ashburton, Broome, Derby-West Kimberley, Exmouth, Greater Geraldton, Karratha, Port Hedland, Shark Bay, Wyndham-East Kimberley.
Habit and structure. Thallus (alga together with sponge symbiont) to 10 cm tall, dark green to purple, erect or decumbent (the latter particularly in the intertidal and areas of high water movement), attached at several points, with terete or slightly flattened axes 3–6(–20) mm wide. Algal axes 100–250(–350) µm in diameter. Outer cortex single layered in vegetative axes, but in fertile axes may consist of small-celled, anticlinal filaments.
Distribution. In W. Aust., known from the tropics south to the Houtman Abrolhos. Widespread in the tropical Indo-Pacific.
Habitat. Epilithic in the intertidal and shallow subtidal.
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Western Australian Herbarium (1998–). FloraBase—the Western Australian Flora. Department of Biodiversity, Conservation and Attractions. https://florabase.dpaw.wa.gov.au/