Beard’s Provinces: South-West Province.
IBRA Regions: Geraldton Sandplains.
IBRA Subregions: Geraldton Hills.
IMCRA Regions: Central West Coast, Eucla, Leeuwin-Naturaliste, WA South Coast.
Local Government Areas (LGAs): Dandaragan, Esperance, Northampton, Rockingham.
Habit and structure. Thallus light to medium brown, 10–25 cm long, with usually two complanately branched fronds from the branched stipe. Holdfast discoid-conical, 4–8 mm across; epilithic. Stipe 2–10 cm long, with di- (or tri-)chotomies at intervals of 1–3 cm, each 1.5–2(–3) mm in diameter. Fronds 10–15 cm long, irregularly pinnate, with alternate branches 1–4 cm apart, 6–12 mm broad in mid parts, 3–6 mm broad in laterals, upper parts prominently serrate, less so below with slightly undulate margins, laterals not or slightly basally constricted; midrib present throughout, prominent below. Structure of fronds 300–500 µm and 8–10 cells thick, with a slight central medulla and an inactive meristoderm.
Reproduction. Thalli monoecious. Conceptacles scattered over terminal branches, prominent, bisexual, with a slight basal tuft of phaeophycean hairs; oogonia sessile, ovoid, 80–110 µm long and 35–50 µm in diameter; antheridia sessile or on branched paraphyses, elongate-ovoid, 16–24 µm long and 8–12 µm in diameter.
Distribution. From Horrocks Beach, W. Aust., to Port Elliot, S. Aust.
Habitat. M. tuberosum is a deep water species, apparently rare.
[After Womersley, Mar. Benthic Fl. Southern Australia II: 414–416 (1987)]
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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/