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The Western Australian Herbarium’s collections management system, WAHerb, and DBCA’s flora taxonomic names application, WACensus, have been set to read-only mode since 1 October 2025. Recent taxonomic changes are not currently being reflected in Florabase, herbarium collections, or the census. The project team is now conducting testing of the migrated data, and a further update will be provided by the end of the financial year (1 July). Please reach out to us if you have any questions or concerns.

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Heterosiphonia crispella (C.Agardh) M.J.Wynne var. crispella

Conservation Code
Not threatened
Naturalised Status
Native to Western Australia
Name Status
Current

Scientific Description

Habit and structure. Thallus erect, to 10 mm tall, attached by rhizoidal filaments from lower cells, with 1–3 percurrent primary axes arising near the base. Primary axes polysiphonous, ecorticate, with 6 pericentral cells, these slightly offset in successive segments; branching distichous with pseudolaterals arising every 2 segments. Polysiphonous segments to 80 µm diam. near the thallus apex [L:B c. 1], broadening to 220 µm near the base [L:B c. 0.6]. Pseudolateral branches to 1.2 mm long, curved towards the apex, monosiphonous except for basal and often suprabasal polysiphonous segments (these with 4 pericentral cells), dichotomously divided every 2 cells; lower cells 50–65 µm diam., tapering gradually to outer cells 35–40 µm; apical cells 18–25 µm diam., pointed but without a spine.

Reproduction. Reproductive structures not seen.

Distribution. Widespread in tropical seas; epiphytic and epilithic in the subtidal.

[After J.M. Huisman in Algae of Australia: Marine Benthic Algae of North-western Australia, 2. Red Algae: 435 (2018)]