Antithamnion nipponicum (Ceramiaceae, Rhodophyta), incorrectly known as A. pectinatum in western Europe, is a recent introduction along the North Carolina and Pacific coasts of North America

Female and male reproductive structures in material from California known as Antithamnion hubbsii are illustrated and described for the first time. This partly prostrate species is characterized vegetatively by pinnae arranged in distichous opposite pairs, bearing adaxial and abaxial pinnules, with...

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