Beard’s Provinces: South-West Province.
IBRA Regions: Warren.
IBRA Subregions: Warren.
IMCRA Regions: Leeuwin-Naturaliste.
Local Government Areas (LGAs): Manjimup.
Habit and structure. Thallus light to medium green, erect, 3–25(–35) cm high with a single or usually densely clustered erect stipes, with the basal cell attached by branched rhizoids; filaments tapering gradually, much branched above usually at almost every cell, forming fastigate tufts. Growth acropetal (intercalary divisions absent or only very few in lower cells), with lateral branches first arising 1–5 cells below the apical cell, with ultimately 1–5 erect laterals (at acute angles) from each parent cell; cross walls at first oblique to parent cell, soon becoming almost horizontal. Apical cells (35–)40–120(–135) µm in diameter, L/B 6–25, linear to the tapering, obtuse to mucronate, apex; ultimate branch cells 40–170 µm in diameter, L/B (3–)6–14; basal stipe cells 350–600(–800) µm in maximum diameter, L/B 10–45; ratio of basal cell to apical cell diameters 5–12; walls thick, expecially in lower cells (25–60 µm), lamellate.
Reproduction. Upper cells are transformed into zooidangia by more-or-less frequent intercalary divisions, with a basal abscission ring.
Distribution. From Cottesloe, W. Aust., around southern Australia to Port Jackson, N.S.W. and around Tas. New Zealand. Madeira. Adriatic.
[After van den Hoek & Womersley in Womersley, Mar. Benthic Fl. Southern Australia I: 196 (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/