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The previously unknown vegetative and reproductive development of Laurencia venusta Yamada (Ceramiales, Rhodophyta) were studied based on specimens collected from Korea and Japan. Each vegetative axial segment bears a trichoblast and four pericentral cells; the first of the latter is always produced below the basal cell of the trichoblast; the second pericentral cell is formed at some distance from...
Dans le genre Pilea Lindl. (Urticaceae), un groupe d'especes neotropicales fondamentalement a petites feuilles (longueur maximale du limbe =< 15<space>mm et longueur des petioles =< 8<space>mm), renferme environ une trentaine de taxons, morphologiquement tres proches, dont le type de base est represente par Pilea microphylla (L.) Liebm. Certaines especes a grandes feuilles possedant...
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