Caulerpa fergusonii Murray
Trans.Linn.Soc.London,Bot. 3:212, Pl. LIII, Figs 1-2 (1891)

Conservation Code: Not threatened
Naturalised Status: Native to Western Australia
Name Status: Current

Distribution

Beard’s Provinces: Northern Province, South-West Province.

IBRA Regions: Geraldton Sandplains, Northern Kimberley.

IBRA Subregions: Geraldton Hills, Mitchell.

IMCRA Regions: Abrolhos Islands, Canning, Central West Coast, Leeuwin-Naturaliste, Pilbara (nearshore), Pilbara (offshore), WA South Coast.

Local Government Areas (LGAs): Ashburton, Broome, Cockburn, Dandaragan, Esperance, Greater Geraldton, Irwin, Karratha, Wanneroo, Wyndham-East Kimberley.

Scientific Description
John Huisman and Cheryl Parker, Thursday 8 September 2016

Habit and structure. Thallus olive-green to dark green, spreading laterally to 18 cm, with smooth stolons 2–3 mm diam., attached to rock by short pillars bearing dense rhizoids. Assimilators mostly sessile. Rachis glossy, to 5 cm tall, simple or rarely branched; segments hexagonal, bearing distichous opposite or alternate ramuli. Ramuli subspherical, obovate to pyriform, slightly compressed, 4–7 mm long and 3–5 mm wide [L:B (1–) 1.5–1.8 (–2.3)], often overlapping.

Distribution. This species has been reported from India, Sri Lanka, Indonesia, Malaysia, Papua New Guinea, the Philippines, Japan and Fiji. In W.A. it is known from the Kimberley as far south as Canal Rocks in the south-west.

Habitat. Epilithic in the intertidal and subtidal.

[After Belton, Huisman & Gurgel, Algae of Australia: Mar. Benthic Algae of North-western Australia, 1. Green and Brown Algae 90 (2015)]