Results are presented of a study on the algae from the waters of Bahía Concepción, B.C.S., in the Gulf of California. The floristic list includes data on the species found, the state of reproduction, tidal levels, type of coast, substrate and epiphytism. Sixty-three species of Rhodophyta, 22 species of Phaeophyta and 18 species of Chlorophyta were identified. The presence of various species in relation to light, temperature and substrate is discussed. The Rhodophyta dominated in terms of species diversity. The algal flora of Bahía Concepción is tropical and its greatest species diversity is found in spring.
An evaluation of Mactt~~stis pyrifem (L.) C. Agardh kelp beds was conducted during the winter of 1985-1986 along the westem coast of Baja California, by means of estimated canopy in four different locations along their distribution range, and the total area covered was measuredby means of aerial infrared photography. The distribution of the kelp beds extends from the United States border to Morro Hermoso, B.C.S., with an absence of kelp in Bahía Vizcafno, B.C. South of Morro Hermoso, B.C.S., recovery of the kelp beds has been slow after the "El Niño" phenomenon (1982-1983) due to competitive replacement by Eiseniu urbo~~a. In the winter of 19851986, coverage by the kelp beds measured 6,485,049m2 and the standing crep was 35,813.l tons 2 2,260 tons, with 40% in the northem and 60% in the southem areas.
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