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Electronic Flora of South Australia Genus Fact Sheet
Phylum Rhodophyta – Order Ceramiales – Family Ceramiaceae – Tribe Crouanieae
Thallus erect from a prostrate base, with pinnate axes, branches compressed in plane of branching, constricted at intervals related to new growth phases, sympodially branched, axial cells with 3 whorl-branchlets, closely adjacent with outer cells cohering lengthwise in a firm gelatinous sheath, lateral branches originating from axial cells, becoming 10–20 cells long before initiation of whorl-branchlets; gland cells absent. Cells uninucleate.
Reproduction: Gametophytes dioecious. Procarps borne in place of whorl-branchlets near branch apices, with a supporting cell bearing a 4-celled carpogonial branch. Post-fertilization connection to the auxiliary cell is via a connecting cell and an erect, rounded gonimolobe develops followed by lateral gonimolobes, surrounded by whorl-branchlets in swollen branch ends. Spermatangia are cut off from terminal cells of whorl-branchlets.
Tetrasporangia occur on basal cells of whorl-branchlets, sessile, subspherical, tetrahedrally divided.
Type species: G. pinnella Harvey 1855a: 555.
Taxonomic notes: A genus of 2 species, the type and G. obtusa Itono (1977: 14) from Japan.
Gattya has whorls of 3 whorl-branches as in Crouania, but differs in its complanately branched thallus with compressed branches and sympodial development of axes.
References:
HARVEY, W.H. (1855a). Some account of the marine botany of the colony of Western Australia. Trans. R. Jr. Acad. 22, 525–566.
ITONO, H. (1977). Studies on the Ceramiaceous algae (Rhodophyta) from southern parts of Japan. Bibliotheca Phycologia 35, 1–499.
The Marine Benthic Flora of Southern Australia Part IIIC complete list of references.
Publication:
Womersley, H.B.S. (24 December, 1998)
The Marine Benthic Flora of Southern Australia
Rhodophyta. Part IIIC. Ceramiales – Ceramiaceae, Dasyaceae
©State Herbarium of South Australia, Government of South Australia
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