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 Conservation listings displayed on Florabase may also be out of date.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

Reference
Sci.Pap.Inst.Algol.Res.Fac.Sci.Hokkaido Imp.Univ. 3:40 (1944)
Conservation Code
Not threatened
Naturalised Status
Native to Western Australia
Name Status
Current

Scientific Description

Habit and structure. Thallus with prostrate and erect axes, light pink, to 2 cm tall, ecorticate, occasionally slightly mucilaginous, attached by multicellular branched rhizoids from basal cells of whorl branches on prostrate axes. Erect axes bearing indeterminate branches alternately or unilaterally every 2–7 cells (more sparse lower down), these arising directly from axial cells in addition to whorl branches. Cells of erect axes 15–35 μm diam. distally [L:B 1.5–2], becoming broader and proportionally shorter proximally, to 150 μm diam. [L:B c. 1.4]. Whorl branches short, congested near the apex and curving upwards, otherwise mostly outwardly directed and not covering the axial filament, divaricately branched, the first division dichotomous, subsequent divisions dichotomous to trichotomous; terminal cells ellipsoidal or elongate, occasionally slightly attenuate.

Reproduction. Tetrasporangia arising 1–3 per whorl, singly on basal cells of whorl branches, spherical to subspherical, 35–50 μm diam., tetrahedrally divided. Other reproductive structures not observed.

Distribution. Widespread in warmer waters of the Indian and Pacific Oceans.

Habitat. Epiphytic on larger algae in the shallow subtidal.

[After J.M. Huisman in Algae of Australia: Marine Benthic Algae of North-western Australia, 2. Red Algae: 366 (2018)]