Habit and structure. Thallus dark green, epilithic, with tufts of several erect, rigid filaments 2–3 cm long, attached by a spreading, lobed, discoid holdfast and also rhizoids from elongate basal cells which are (1.5–)2–3(–4) mm long, clavate and 300–500 µm in diameter at their upper ends. Filaments only slightly increasing in diameter upwards. Cells 400–600 µm in diameter and L/B 1.5–2 below, and 400–800(–1000) µm in diameter and L/B 1–1.5( –2) above; cells not to moderately incised at cross walls; wall 30–50 µm thick; chloroplasts densely reticulate with numerous pyrenoids.
Reproduction. Unknown for Australian plants; elsewhere by biflagellate and quadriflagellate zoospores.
Distribution. In Australia, known from Belinda Beach, N side of Middle I., Recherche Archipelago, W. Aust., and Flat Rock Bay, S coast of Yorke Pen, S. Aust.
Habitat. In sand near shore on rock platform.
[After Womersley, Mar. Benthic Fl. Southern Australia I: 174 (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/