Abstract
Abstract A study of different populations of Predaea (Gymnophloeaceae, Rhodophyta) in the Mediterranean Sea confirms the existence of two species: P. ollivieri J. Feldmann and P. pusilla (Berthold) J. Feldmann. Not collected since its original description from Naples, P. pusilla has been rediscovered in several areas of the Western Mediterranean Sea and in the Adriatic Sea. The characters of these species are described. Predaea ollivieri, which has the gonimoblast inserted on the connecting filament, differs from P. bisporifera Kajimura, P. masonii (Setchell et Gardner) G. De Toni and P. subpeltata Dawson, both in morphology (thallus subdichotomous to irregularly branched) and in the number of nutritive cells (3–15 per bearing cell). Predaea pusilla, which has a gonimoblast inserted laterally on the auxiliary cell, differs from P. kraftiana Millar et Guiry in its three-celled carpogonial branches without a lateral sterile cell, in the fact that its carpogonium does not divide transversely after fertilizat...
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