- Reference
- Analecta Algol. 1:76-77 (1894)
- Conservation Code
- Not threatened
- Naturalised Status
- Native to Western Australia
- Name Status
- Current
Scientific Description
Habitat and structure. Thallus medium to dark brown, (5–)10–20 cm long, dichotomously branched at intervals of (1–)1.5–5 cm, branches (3–)5–15(–20) mm broad, usually increasing in width above points of branching, axils rounded, apices broad and usually truncate with a slightly depressed apical cell; proliferations absent except following damage. Holdfast rhizoidal; epilithic. Cortical cells 14–22 µm across, L/B1–1.5(–2). Medulla in upper and mid parts of thallus one cell thick centrally, 3–4 cells thick near the margins, in older parts becoming 2 cells thick centrally; thickness centrally 120–160 µm, becoming 200–240 µm thick below, margins 240–320 µm thick; intracellular wall thickenings present in medullary cells of some thalli. Hair tufts scattered, hairs 16–24 µm in diameter.
Reproduction.Unknown.
Distribution From the Houtman Abrolhos, W. Aust., to Port Phillip Heads, Vic.
Habitat. D. robusta is a deep water species off open coasts, known from 10 to 50 m deep.
[After Womersley, Mar. Benthic Fl. Southern Australia II: 202 (1987) as Dilophus robustus]
Distribution
- IBRA Regions
- Esperance Plains, Geraldton Sandplains, Swan Coastal Plain.
- IBRA Subregions
- Geraldton Hills, Perth, Recherche.
- IMCRA Regions
- Abrolhos Islands, Central West Coast, Leeuwin-Naturaliste, WA South Coast.
- Local Government Areas (LGAs)
- Augusta Margaret River, Cockburn, Dandaragan, Esperance, Greater Geraldton, Irwin, Jerramungup.