First Reports of Padina antillarum and P. glabra (Phaeophyta-Dictyotaceae) from Florida, with a Key to the Western Atlantic Species of the Genus

—Padina antillarum (Kützing) Piccone and P. glabra Gaillard are newly reported for Florida. The first species, which has been widely reported from the Indo-Pacific under the name P. tetrastromatica Hauck, has seldom been reported from the Western Atlantic. The type locality of P. antillarum is Trinidad in the Lesser Antilles, and there are reports of its occurrence from Venezuela and Colombia. Observations are provided on tetrasporangiate and oogonial plants collected from Brevard County, Florida. Padina glabra, first described from Senegal, northwest Africa, has been collected on three occasions from Anastasia Island, Saint Augustine, St. Johns County, Florida. The Florida material agrees in most respects with the original description of P. glabra except for the larger size of the Florida thalli and the fact the thalli bear plantules in addition to sporangia. A key to the Western Atlantic species of Padina is provided.