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Service Notice

The Western Australian Herbarium’s collections management system, WAHerb, and DBCA’s taxonomic names application, WACensus, have been set to read-only mode since 1 October 2025. Recent taxonomic changes are not reflected in Florabase, herbarium collections, or in the census. We are hoping to be able to reinstate services around December 15; we will provide an update at that time.

The notice period started at 9:00 am on Wednesday, 1 October 2025 +08:00 and will end at 12:00 pm on Monday, 15 December 2025 +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.