A MORPHOLOGICAL STUDY OF FIMBRIFOLIUM, A NEW GENUS IN THE CYSTOCLONIACEAE (GIGARTINALES, RHODOPHYTA)1

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Abstract
Fimbrifolium is described as a new genus for the taxon, Rhodophyllis dichotoma (Lepechin) Gobi. Vegetatively, Fimbrifolium dichotomum is similar to some species of Rhodophyllis and Craspedocarpus, but reproductively it differs from these genera in three main features: the carposporophyte develops with the first gonimoblast initial produced in an outward direction away from the axis; at maturity, the carposporophyte consists of a central fusion cell with outwardly radiating chains of carposporangia and inwardly radiating nutritive filaments; and, in the mature tetrasporophyte, tetrasporangia are borne in an intercalary position in cortical rosette‐filaments. The relative importance of these features as generic characteristics in the family is discussed.