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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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Dictyomenia angusta J.Agardh

Reference
Acta Univ.Lund. 60-61 (1897)
Conservation Code
Not threatened
Naturalised Status
Native to Western Australia
Name Status
Current

Scientific Description

Habit and structure. Thallus dark brown-red, erect, 10–25 cm high, complanately and irregularly branched with indeterminate branches 1–2 mm broad and separated by 3 to many determinate laterals on each side. Determinate laterals 2–3(–5) mm long, slender, usually with 2–3 apical branches, 2–5 mm apart on each side of indeterminate branches, denuded near the thallus base. Holdfast probably fibrous (inadequately seen). Structure. Apical structure not observed. Axial cells moderately conspicuous, branching to the determinate laterals every 3–4 cells. Indeterminate branches with 6 pericentral cells, corticated from near the apices; indeterminate laterals corticated. Trichoblasts not observed.

Reproduction.Only tetrasporangial branch clusters seen, situated on the surface over lateral veins of determinate laterals, much branched; tetrasporangia immature.

Distribution. Port Elliot, S. Aust., and Walkerville, Vic. J. Agardh placed similar specimens from Geographe Bay, W. Aust., under this species.

[After Womersley, Mar. Benthic Fl. Southern Australia IIID: 345–347 (2003)]