Beard’s Provinces: Eremaean Province, South-West Province.
IBRA Regions: Esperance Plains, Geraldton Sandplains, Hampton, Jarrah Forest, Swan Coastal Plain, Warren.
IBRA Subregions: Geraldton Hills, Hampton, Perth, Recherche, Southern Jarrah Forest, Warren.
IMCRA Regions: Central West Coast, Eucla, Leeuwin-Naturaliste, WA South Coast.
Local Government Areas (LGAs): Augusta-Margaret River, Busselton, Cambridge, Cockburn, Coorow, Cottesloe, Dandaragan, Dundas, Esperance, Fremantle, Irwin, Northampton, Rockingham, Wanneroo.
Habit and structure. Thallus medium green, firm, erect, regularly and frequently dichotomously branched, to 1 m high, with branches uniformly terete, not tapering, 4–7 mm in diameter. Utricles stout, irregularly cylindrical to clavate, (130–)200–500(–700) µm in maximum diameter (below apex), (650–)750–1300(–1500) µm long; utricle apical wall rounded to truncate, moderately to (usually) markedly thickened forming a laminate galeate cap up to 125 µm thick; hairs (or scars) occasional, one to few per utricle. Medullary filaments usually 30–80 µm in diameter, with a prominent plug adjacent to origin from utricle.
Reproduction. Gametangia elongate-ovoid to cylindrical, 55–185 µm in diameter, 275–530 µm long.
Distribution. From Champion Bay, W. Aust., around southern Australia and Tas., to Ballina, N.S.W.
Habitat. C. galeatum is a common species on rough-water coasts along southern Australia, from low tide level down to 37 m.
[After Womersley, Mar. Benthic Fl. Southern Australia I: 235 (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/