Habitat and structure. Thallus light to medium brown, 3–6 cm long, becoming alternately branched at intervals of 0.5–1 cm, branches 2–4 mm broad with slightly irregular margins, usually basally constricted and broadening above points of branching, axils acute to rounded, apices truncate and bearing terete to slightly compressed fibrils, 1–4 times branched, 2–6 mm long and 120–200 µm in diameter. Holdfast rhizoidal; probably epilithic. Cortical cells 10–20 µm across, L/B 1–2(–3). Medulla one cell thick centrally throughout the thallus (as far as known), 2(–3) cells thick near the margins; thickness centrally 80–120(–180) µm, marginally 150–180 µm thick above and 300–350 µm thick below. Hair tufts scattered.
Distribution. Only known from the type collection [Rottnest I., W. Aust.]
[After Womersley, Mar. Benthic Fl. Southern Australia II:2 06 (1987) as Dilophus crinitus]
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