Ceratodictyon spongiosum Zanardini
Nuovo Giorn.Bot.Ital. 10:37 (1878)

Conservation Code: Not threatened
Naturalised Status: Native to Western Australia
Name Status: Current


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.

Scientific Description
John Huisman & Cheryl Parker, Thursday 8 September 2016

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.