NOTES ON THE BENTHIC MARINE-ALGAE OF PUERTO-RICO .6. ADDITIONS TO THEFLORA

Ten species of benthic marine macroalgae are reported for the first ti me from coastal waters of Puerto Rico. These species include Rhipilioy sis profunda (Eiseman et S. A. Earle) J. N. Norris et Blair [Chlorophy ta], Predaea weldii Kraft et I. A. Abbott, Halymenia bermudensis Colli ns et M. Howe, Titanophora cfr. incrustans (J. Agardh) Borgesen, Hypne a volubilis Searles, Flahaultia tegetiformis W. R. Taylor, Rhodymenia divaricata E. Y. Dawson, Monosporus indicus Borgesen, Dasya antillarum (M. Howe) Millar, and Heterosiphonia hummii Aregood [Rhodophyta]. The above collections of Rhipiliopsis, Titanophora, Hypnea, Rhodymenia an d Heterosiphonia also represent first reports for the Caribbean. These records also include the first reports of male and female gametophyte s of Hypnea volubilis and female gametophytes of Dasya antillarum. The designation of a lectotype for Heterosiphonia hummii is proposed.