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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 Conservation listings displayed on Florabase may also be out of date.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.

Siphonocladus tropicus (P.Crouan & H.Crouan) J.Agardh

Reference
Algern.Syst. 105 (1887)
Conservation Code
Not threatened
Naturalised Status
Native to Western Australia
Name Status
Current

Scientific Description

Habit and structure. Thallus upright, to 4–5 cm high, attached by non-septate rhizoids, with numerous erect cylindrical axes arising from the base. Axes to 3mm in diameter, with basal annular constrictions. Lateral branches formed from protoplasts of parent branch, these rounding-up and then forming irregularly radial protrusions along the parent branch that grow to 1–2 cm in length. All branches with rounded apices.

Distribution. Tropical waters generally. In W. Aust. south to Rottnest I.

Habitat. Epilithic in the subtidal.

John Huisman & Cheryl Parker, 3 August 2021

Distribution

IBRA Regions
Pilbara.
IBRA Subregions
Roebourne.
IMCRA Regions
Abrolhos Islands, Central West Coast, Leeuwin-Naturaliste, Ningaloo, Pilbara (nearshore), Pilbara (offshore).
Local Government Areas (LGAs)
Ashburton, Cockburn, Dandaragan, Exmouth, Greater Geraldton, Karratha.