Skip to main content

Service Notice

The Western Australian Herbarium’s collections management system and census were set to read-only mode on 1 October 2025. Taxonomic updates published since this time are not being reflected in Florabase, herbarium collections, or Western Australia’s taxonomic names census (Nomos). Conservation listings displayed on Florabase may also be out of date. Please refer to DBCA’s Threatened species and communities webpage for the most recent Threatened and Priority Flora List, noting that recent taxonomic updates are similarly not included. Our database migration is moving to a staging phase. We thank you for your patience as we ensure the integrity of our biodiversity data, develop new workflows, and train staff to use the new systems. Please reach out to us if you have any questions or concerns.

The notice period started at 12:00 pm on Wednesday, 1 October 2025 +08:00 and will end at 12:00 pm on Friday, 1 January 2027 +08:00.

Advanced Search

Cladurus alterniferus Huisman

Reference
Algae of Australia: Marine Benthic Algae of North-western Australia, 2. Red Algae 500, Fig. 145A-C (2018)
Conservation Code
Not threatened
Naturalised Status
Native to Western Australia
Name Status
Current

Scientific Description

Habit and structure. Thallus erect, dark brown-red, to 14 cm tall, with 1 or 2 percurrent axes arising from a discoid holdfast, radially branched every 2–5 mm (but appearing distichous in pressed specimens) and often with axillary branches. Axes terete; primary axes cartilaginous below, 2–3 mm diam., tapering only slightly; lateral branches 1–2 mm diam., each order of branching progressively narrower, with distinct constrictions at bases, slightly curved upwards; apices rounded or tapering to a fine point, with obvious trichoblasts. Axes in surface view appearing tiered due to very large pericentral cells and the relatively thin cortex. Structure polysiphonous, with 5 large pericentrals, these prominent throughout the thallus, covered by a cortex of markedly smaller cells.

Reproduction. Reproduction not observed.

Distribution. Known from Barrow Island and the Dampier Archipelago, north-western Australia.

Habitat. Epilithic in the subtidal.

[After J.M. Huisman in Algae of Australia: Marine Benthic Algae of North-western Australia, 2. Red Algae: 500 (2018)]

John Huisman & Olga Nazarova, 3 August 2021

Distribution

IMCRA Regions
Pilbara (nearshore), Pilbara (offshore).
Local Government Areas (LGAs)
Ashburton, Karratha.