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Service Notice

The Western Australian Herbarium’s collections management system, WAHerb, and DBCA’s taxonomic names application, WACensus, have been set to read-only mode since 1 October 2025. Recent taxonomic changes are not reflected in Florabase, herbarium collections, or in the census. We are hoping to be able to reinstate services around December 15; we will provide an update at that time.

The notice period started at 9:00 am on Wednesday, 1 October 2025 +08:00 and will end at 12:00 pm on Monday, 15 December 2025 +08:00.

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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.