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 Conservation listings displayed on Florabase may also be out of date.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

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Halimeda macrophysa Askenasy

Reference
Forschungsr.Gazelle, Bot.Alg. 4:14 Pl. 4, Figs 1-4 (1888)
Conservation Code
Not threatened
Naturalised Status
Native to Western Australia
Name Status
Current

Scientific Description

Habit and structure. Thallus erect but tending to sprawl, pale green (occasionally with a hint of blue), epilithic, typically growing between coral and in reef cavities, dichotomously to trichotomously branched; axes imbricate. Segments moderately calcified, chalky and dull, variously orientated, mostly reniform with entire margins, flattened but often curled (particularly the distal margins); surfaces appearing pitted due to large utricles. Utricles in 2 or 3 layers; peripheral utricles clavate, 150–200 μm diam., in surface pits formed by the calcification, laterally free after decalcification. Secondary utricles much smaller, obdeltoid; tertiary utricles elongate, cylindrical. Medullary siphons 35–100 µm diam., broadest subtending dichotomies, fusing in groups of 2 or 3 at nodes .

Distribution. Widespread in the Indo-West Pacific.

Habitat. Epilithic in the subtidal.

[After Huisman & Verbruggen, Algae of Australia: Mar. Benthic Algae of North-western Australia, 1. Green and Brown Algae 134 (2015)]