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Sexual reproduction in thorea bory rhodophyta thoreaceae

Sexual reproduction in thorea bory rhodophyta thoreaceae

Japanese Journal of Phycology 35(2): 106-112

Spermatangium, carpogonium and carposporophyte are described from Brazilian material of Thorea bachmannii. In addition, "Chantransia" stage is also described. These plants are dioecious and male plants are clearly distinguished from the female ones by their slender thalli. Spermatangia are borne in pairs terminally and sub-terminally on short specialized branches. Carpogonia are conical. Carpogonial branches are borne laterally on short vegetative branches and consist of one or two short cylindrical or barrel-shaped, slightly pigmented cells. The trichogyne is elongate filiform and straight or curved. The gonimoblast filaments develop directly from the fertilized carpogonium. The carposporophyte is arranged in clusters without any kind of envoltorium. Gonimoblast filaments are short and sparsely branched. They are composed of cylindrical cells compactly arranged. Carposporangia are borne singly and in pairs, terminally and sub-terminally on gonimoblast filaments, with a dense and strongly colored content. "Chantransia" stage arises in small tufts from a prostrate crustose basis which gives rise to abundantly and irregularly branched basal filaments and upper straight upright filaments of cylindrical elongate cells. Monosporangia are borne singly on short lateral branches and they are globose, ovoidal or obovoidal. Taxonomic implications of the findings are fully discussed. An amendment is proposed to the genus, since in the original diagnosis sexual reproductive organs, carposporophyte and "Chantransia" stage were not mentioned.

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Accession: 006408936

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