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Service Notice

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 Herbarium team, working with the Biodiversity Information Office, now have the Nomos-hosted WACensus in production, and we will begin to update the flora and fungi for WA within the system soon. The Specify project team continues to test and streamline the new collections management system, and we expect this to be online in October. 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 Thursday, 1 October 2026 +08:00.

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Ceramium subdichotomum Weber Bosse

Reference
Liste Alg.Siboga 3:333-334, Fig. 125 (1923)
Conservation Code
Not threatened
Naturalised Status
Native to Western Australia
Name Status
Current

Scientific Description

Habit and structure. Thallus erect, to 9 mm tall, with a limited prostrate axis, attached by rhizoids. Branching pseudosympodial or subdichotomous, distichous. Apices straight or slightly forcipate. Structure with 12–16 periaxial and pseudoperiaxial cells, these angular and cutting off 2 acropetal and 2 basipetal cell layers. Nodal cortication 200–250 diam., 90–100 μm long when mature. Vesicular cells often present in nodes, dome-shaped, spherical in surface view, 10–20 μm diam.

Reproduction. Tetrasporangia mostly naked, their base partly immersed in nodal cells, without an involucre, clustered unilaterally on surface of node, spherical to pyriform, 30–60 μm diam., often with a thick sporangial wall, tetrahedrally divided. Other reproductive structures not observed.

Distribution. Known from Indonesia, India, the Seychelles, Oman, the South Pacific Ocean and northern Australia.

Habitat. Usually epiphytic.

[After J.M. Huisman in Algae of Australia: Marine Benthic Algae of North-western Australia, 2. Red Algae: 404–406 (2018)]