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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. Due to the rapidly approaching holiday season and associated agency and facility soft closures, along with the substantial work involved in data mapping, cleaning, and verification, the migration to the new collection management software is not expected to occur before 1 March 2026, when a further update will be provided. Please reach out to us if you have any questions or concerns.

The notice period started at 9:45 am on Friday, 12 December 2025 +08:00 and will end at 12:00 pm on Monday, 2 March 2026 +08:00.

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Acrochaetium humile (Rosenv.) Børgesen

Reference
Dansk Bot.Ark. 3:23 (1915)
Conservation Code
Not threatened
Naturalised Status
Native to Western Australia
Name Status
Current

Scientific Description

Habit and structure. Thallus to 160 µm tall exclusive of hairs, arising from a prostrate base. Erect axes slightly arcuate, secundly branched; cells 9–16 µm long and 4–7 µm diam. Most filaments terminating in an elongate hair 80–90 µm long borne centrally or slightly laterally. Intercalary cells also often with lateral hairs. Each cell with a stellate plastid and a central pyrenoid 3–4 µm diam.

Reproduction. Monosporangia secund, sessile or pedicellate, ellipsoidal, c. 16 × 7–9 µm.

Distribution. This species is seemingly widespread, but most records are from predominantly temperate or cooler regions.

Habitat. Epizoic in the shallow subtidal in Western Australia.

[After J.M. Huisman & W.J. Woelkerling in Algae of Australia: Marine Benthic Algae of North-western Australia, 2. Red Algae: 20 (2018)]