Beard’s Provinces: South-West Province.
IBRA Regions: Swan Coastal Plain.
IBRA Subregions: Perth.
IMCRA Regions: Central West Coast, Leeuwin-Naturaliste.
Local Government Areas (LGAs): Cottesloe, Rockingham.
Habit and structure. Thallus firm, medium to dark green, regularly dichotomous, to 20 cm high, branches terete, slender, tapering slightly from 3 mm in diameter near the base to 1–2 mm near the apices. Utricles slender when young, becoming stout, irregularly cylindrical, 80–270 µm in diameter, 470–680 µm long, apices asymmetrical and strongly acuminate (to 80 µm long) with the wall of the mucro thickened, finely lamellate and often chambered; hairs (or scars) common. Medullary filaments 20–30 µm in diameter with the plug adjacent to the utricle base.
Reproduction. Gametangia elongate-ovoid, 70–160 µm in diameter, 175–240 µm long, 1–3 per utricle, borne on a short protuberance just below middle of utricle.
Distribution. Known from the Abrolhos I., W. Aust., to the Head of the Great Australian Bight, S. Aust.
[After Womersley, Mar. Benthic Fl. Southern Australia I: 240 (1984)]
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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/