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Electronic Flora of South Australia Genus Fact Sheet
Phylum Rhodophyta – Family Rhodomelaceae – Tribe Herposiphonieae
Thallus entirely prostrate, with compressed indeterminate axes bearing alternate determinate laterals from successive segments, with the next segment unbranched but with the dorsal pericentral cell dividing to give a small isodiametric cell. Structure. Pericentral cells 10–12, 6–7 in face view, ecorticate. Determinate laterals alternately pinnate, lower branches bearing a trichoblast. Rhizoids cut off from the marginal pericentral cells of axes, unicellular with multicellular haptera. Cells uninucleate.
Reproduction: Gametophytes dioecious. Procarps unknown. Carposporophytes with a branched gonimoblast and terminal carposporangia. Cystocarps ovoid, sessile, pericarp ecorticate. Spermatangial organs replacing trichoblasts.
Tetrasporangia in simple stichidia replacing determinate laterals, in a straight row, one per segment.
Type species: Herpopteros fallax Falkenberg in Schmitz & Falkenberg 1897: 461.
Taxonomic notes: Herpopteros is characterized by the alternate, single, branched, determinate laterals on successive segments, the next segment having only a divided dorsal pericentral cell (not a single cell from the axial cell, as in Ditria).
References:
SCHMITZ, F. & FALKENBERG, P. (1897). Rhodomelaceae. In Engler, A. & Prantl, K., Die natürlichen Pflanzenfamilien. T.1. Abt. 2, pp. 421–480. (Englemann: Leipzig.)
The Marine Benthic Flora of Southern Australia Part IIID complete list of references.
Publication:
Womersley, H.B.S. (24 February, 2003)
The Marine Benthic Flora of Southern Australia
Rhodophyta. Part IIID. Ceramiales – Delesseriaceae, Sarcomeniaceae, Rhodomelaceae
Reproduced with permission from The Marine Benthic Flora of Southern Australia Part IIID 2003, by H.B.S. Womersley. Australian Biological Resources Study, Canberra. Copyright Commonwealth of Australia.
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