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 Conservation listings displayed on Florabase may also be out of date.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

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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)]