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キーワード:
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要旨:
The heteroside floridoside has been recorded in 21 specimens of Laurencia, as well as in some closely related species: Osmundea hybrida (A.P. de Candolle) Nam, O. pinnatifida (Hudson) Stackhouse, O. spectabilis (Postels et Ruprecht) Nam, O. truncata (Kutzing) Nam et Maggs and Chondria ia capensis (Harvey) Askenasy (Rhodomelaceae, Ceramiales). The occurrence of this carbohydrate in the Ceramiales negates the proposition that the presence of floridoside is a chemotaxonomic marker only for orders of the Rhodophyta other than the Ceramiales. Digeneaside, which is known as a characteristic photo-assimilatory product only in representatives of the Ceramiales, was not detected in any of the species investigated, including five species in which it was previously detected; its previously proposed high diagnostic value is negated and its reported occurrence in these species is questioned.
