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Electronic Flora of South Australia Genus Fact Sheet
Phylum Rhodophyta – Order Ceramiales – Family Ceramiaceae – Tribe Monosporeae
Thallus erect, small, ecorticate, irregularly branched, with a prostrate base attached by rhizoids with digitate haptera. Cells multinucleate.
Reproduction: Propagules with a large ovoid cell and a short, trapeziform, basal cell, borne on a 2-celled stalk.
Gametophytes dioecious. Procarps borne on the subapical cell of short axes, with 3 periaxial cells, one (the supporting cell) bearing a 4-celled carpogonial branch and a sterile terminal cell, with the hypogenous cell larger. Post-fertilization the supporting cell and adjacent periaxial cell cut off auxiliary cells each of which produces a gonimolobe. The sterile procarp cells each produce a short involucral branchlet. Spermatangial heads occur on the laterals.
Tetrasporangia occur on cells of the laterals, subspherical, tetrahedrally divided.
Type species: G. repens Huisman & Kraft 1992: 128, figs 1–20.
Taxonomic notes: Guiryella is characterised by the propagules with a large ovoid spore and short trapeziform basal cell, on a 2-celled stalk, 3 periaxial cells and short involucral branchlets from the sterile cells of the procarp, and tetrahedrally divided sporangia.
The genus is monospecific.
References:
HUISMAN, J.M. & KRAFT, G.T. (1992). Disposal of auxiliary cell haploid nuclei during post-fertilisation development in Guiryella repens gen. et sp. nov. (Ceramiaceae, Rhodophyta). Phycologia 31(2), 127–137.
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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