New records of marine algae from the 1974 R/V Dolphin cruise to the Gulf of California

Summary: Six species of benthic marine algae (one Chlorophyta, two Phaeophyta, and three Rhodophyta) are newly reported from the Gulf of California, Mexico. Species of Halicystis, Sporochnus, Bonnemaisonia, Dudresnaya, and Sebdenia represent genera new to the Gulf, with the last being new to North America. The distribution of twelve other species is extended. Two new nomenclatural combinations, Dasya baillouviana var. nudicaulus and Dasya baillouviana var. stanfordiana, are proposed. The morphological variation of some species is discussed. Spermatangia of Dudresnaya colombiana, and tetrasporangia and spermatangia of Kallymenia pertusa are reported and described for the first time.

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