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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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Spermothamnion cymosum (Harv.) G.De Toni

Reference
Syll.Alg. 1226 (1903)
Conservation Code
Not threatened
Naturalised Status
Native to Western Australia
Name Status
Current

Scientific Description

Habit and structure. Thallus densely tufted, 2–4 cm high, with entangled, branched, prostrate filaments producing erect filaments which are sparingly and irregularly to subdichotomously branched. Prostrate filaments attached by digitate haptera; epilithic. Structure. Prostrate filaments 50–100 µm in diameter, cells L/D 6–7. Cells multinucleate; rhodoplasts discoid.

Reproduction. Gametophytes unknown. Tetrasporangia terminal on short pedicels borne laterally on upper cells of erect axes, with further pedicels producing clusters, 50–70 µm in diameter, tetrahedrally (or with 8) divided.

Distribution.Rottnest I., to King George Sound, W. Aust., and Vivonne Bay, Kangaroo I., S. Aust. Lord How I.

[After Womersley, Mar. Benthic Fl. Southern Australia IIIC: 225 (1998)]

John Huisman & Cheryl Parker, 3 August 2021

Distribution

IBRA Regions
Swan Coastal Plain, Warren.
IBRA Subregions
Perth, Warren.
Local Government Areas (LGAs)
Cockburn, Manjimup.