Skip to main content

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 Conservation listings displayed on Florabase may also be out of date.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

Advanced Search

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)]