Abstract
Ontogeny of the vegetative system and reproductive structures found in Hymenena media (Hoyt) Taylor (Delesseriaceae, Nitophylleae) indicates that the alga is similar to the Phycodrys group in its vegetative development, and to the Nitophyllum group in its female reproductive system. The vegetative system bears striking resemblance to the type species of a European genus, Radicilingua [R. thysanorhizans (Holm.) Papenf.]. Reproductive structures of two other species of this genus, R. adriatica (Kylin) Papenf. and R. reptans (Zanard.) Papenf. and the type species are inadequately known. On the basis of several vegetative characters and the location and superficial organisation of the tetrasporangial sori, a new genus, Calonitophyllum, is proposed to contain our Western Atlantic plants. The new combination, Calonitophyllum medium (Hoyt) Aregood, thus replaces Hymenena media (Hoyt) Taylor.
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