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 Conservation listings displayed on Florabase may also be out of date.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

Gracilaria arcuata Zanardini

Reference
Mem.Reale Ist.Veneto Sci. 7:265-266, Pl. V, Fig. 2 (1858)
Conservation Code
Not threatened
Naturalised Status
Native to Western Australia
Name Status
Current

Scientific Description

Habit and structure. Thallus erect, deep red to greenish purple, arising from a discoid holdfast. Axes terete, 1.5–3 mm in diameter, often arcuate, unconstricted or with slight constrictions at the bases of lateral branches; branching irregular but often secund and divaricate. Apices pointed. Structure pseudoparenchymatous, with a medulla of large hyaline cells 100–500 µm in diameter, grading outwardly to a cortex of 2–4 layers of smaller, pigmented cells. Epidermal cells 6–11 µm in diameter.

Reproduction. Reproductive structures not observed.

Distribution. Widespread in warmer waters of the Indian and Pacific Oceans.

Habitat. Epilithic in shallow water.

John Huisman & Cheryl Parker, 3 August 2021

Distribution

IBRA Regions
Carnarvon, Dampierland.
IBRA Subregions
Cape Range, Pindanland.
IMCRA Regions
Pilbara (offshore).
Local Government Areas (LGAs)
Ashburton, Broome, Cocos Islands, Karratha.