THE DESCRIPTION OF HYPOGLOSSUM-SUBSIMPLEX SP-NOV (DELESSERIACEAE, RHODOPHYTA) FROM THE FLORIDA KEYS, GULF-OF-MEXICO

Hypoglossum subsimplex sp. nov. is described from the Florida Keys, Gu lf of Mexico, which raises the total to 8 species of Hypoglossum occur ring in the western tropical and subtropical Atlantic. Distinctive cha racteristics of the new species include its very small size (to 6 mm i n height), its usually simple or sub-simple blades, its long, continuo us tetrasporangial sori, the restriction of the tetrasporangia to the primary layer, and the absence of a corticated midrib.