Beard’s Provinces: Eremaean Province, Northern Province.
IBRA Regions: Carnarvon, Dampierland, Pilbara.
IBRA Subregions: Cape Range, Pindanland, Roebourne.
IMCRA Regions: Canning, Kimberley, Northwest Shelf, Pilbara (offshore).
Local Government Areas (LGAs): Ashburton, Broome, Derby-West Kimberley, Karratha, Wyndham-East Kimberley.
Habit and structure. Thallus erect or decumbent, repent, attached by a spongy base, ±regularly dichotomously branched, at times with trichotomies. Branches terete, to 4 mm diam. Utricles produced individually by enlargement of interutricular filaments, cylindrical or clavate, (330–) 450–550 (–800) μm long, (60–) 75–180 (–200) μm diam., constricted in a zone 80–140 μm below the rounded or truncate apices; utricular wall 1.5 μm thick, unornamented. Hairs (or hair scars) common in a zone (40–) 60–75 (–115) μm below the apex of the utricle. Medullary filaments (20–) 25–30 (–40) μm diam. Gametangia fusiform or elliptical, (130–) 175–210 (–270) μm long, (40–) 65–85 (–110) μm diam., 1 or 2 per utricle, borne on a short pedicel in a zone 190–310 μm below the apex.
Distribution. Indo-West Pacific.
Habitat. Epilithic or epiphytic in the intertidal and subtidal.
[After Silva & Chacana, Algae of Australia: Mar. Benthic Algae of North-western Australia, 1. Green and Brown Algae 107 (2015)]
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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/