Udotea flabellum (J.Ellis & Sol.) M.Howe
Bull.Torrey Bot.Club 31:94 (1904)

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


Beard’s Provinces: Eremaean Province, Northern Province.

IBRA Regions: Carnarvon, Dampierland, Northern Kimberley, Pilbara.

IBRA Subregions: Cape Range, Mitchell, Pindanland, Roebourne.

IMCRA Regions: Canning, Kimberley, Pilbara (nearshore), Pilbara (offshore), Shark Bay.

Local Government Areas (LGAs): Ashburton, Broome, Carnarvon, Karratha, Wyndham-East Kimberley.

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

Habit and structure. Thallus green, moderately calcified, the exposed part to 15 cm tall, with a terete stalk and a flabellate to cuneate or much-divided distal region, arising from a large bulbous holdfast often equal in length to the exposed frond, composed of filaments that bind sand particles. Stipe composed of branched siphons bearing lateral appendages similar to those of the blade, but also with numerous rhizoidal siphons 25–40 μm diam. Blade multistratose, with subparallel terete primary siphons 35–60 μm diam., bearing richly branched lateral appendages 150–400 μm long, these digitate, slightly constricted 25–30 μm above the base, imbricate and forming a pseudocortex.

Distribution. Widespread in tropical regions, including Qld. In W.A. south to the Montebello Islands.

Habitat. Generally found in sand in the shallow subtidal.

[After Huisman, Algae of Australia: Mar. Benthic Algae of North-western Australia, 1. Green and Brown Algae 149 (2015)]