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Genus SOLIERIA J. Agardh 1842: 156

Phylum Rhodophyta – Class Florideophyceae – Order Gigartinales – Family Areschougiaceae

Thallus erect, irregularly radially branched, branches terete to only slightly compressed, basally constricted and tapering gradually above; holdfast fibrous, branched. Structure multiaxial, with each axial cell producing a single periaxial cell, successive periaxials orthostichous, developing a lax, filamentous medulla of longitudinal filaments, cross linking filaments, and rhizoids, and a pseudoparenchymatous cortex.

Reproduction: Sexual thalli dioecious; non-procarpic. Carpogonial branches 3–4-celled, usually without sterile cells, directed inwards with a reflexed trichogyne; fertilized carpogonium producing a single, non-septate, connecting filament. Auxiliary cell an inner cortical cell in a darkly staining complex, producing an inward gonimoblast initial and developing a fusion cell with radial gonimoblasts bearing terminal carposporangia, and with some connecting to the enveloping tissue. Cystocarps within the medulla, with a well-developed enveloping tissue of ovoid-celled filaments, swelling the branches, ostiolate. Spermatangia cut off from outer cortical cells.

Tetrasporangia scattered in the outer cortex, laterally attached, zonately divided.

Life history triphasic with isomorphic gametophytes and tetrasporophytes.

Type species: S. chordalis (C. Agardh) J. Agardh 1842: 156.

Taxonomic notes: The type species has been described in detail by Gabrielson & Hommersand (1982a). The genus contains 7–8 species (Gabrielson & Kraft 1984, p. 218), some of which require further investigation.


AGARDH, J.G. (1842). Algae Maris Mediterranei et Adriatici, Observationes in Diagnosin Specierum et Dispositionem Generum. (Fortin, Masson: Paris.)

GABRIELSON, P.W. & HOMMERSAND, M.H. (1982a). The Atlantic species of Solieria (Gigartinales, Rhodophyta): their morphology, distribution and affinities. J. Phycol. 18, 31–45.

GABRIELSON, P.W. & KRAFT, G.T. (1984). The Marine Algae of Lord Howe Island (N.S.W.): the Family Solieriaceae (Gigartinales, Rhodophyta). Brunonia 7, 217–251.

The Marine Benthic Flora of Southern Australia Part IIIA complete list of references.

Author: H.B.S. Womersley

Publication: Womersley, H.B.S. (14 January, 1994)
The Marine Benthic Flora of Southern Australia
Rhodophyta. Part IIIA, Bangiophyceae and Florideophyceae (to Gigartinales)
Reproduced with permission from The Marine Benthic Flora of Southern Australia Part IIIA 1994, by H.B.S. Womersley. Australian Biological Resources Study, Canberra. Copyright Commonwealth of Australia.


1. Branches mostly 2–5 mm in diameter, with few small laterals

S. robusta

1. Branches with numerous, progressively slenderer, laterals, 1–1.5 mm in diameter in lower branches, decreasing to 200–400 µm in diameter in lesser laterals

S. tenera

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