Ectocarpus has an isomorphic alternation of generations. Macrocystis and Nereocystis are members of the Division Phaeophyta. Dictyota is a brown alga which grows by division of a single large apical cell. Fucus plants are diploid. Polysiphonia produces motile gametes.
Red algae are most diverse in the warm ocean waters of the tropics.
A unicellular member of the red algae is Nemalion . Polysiphonia and Porphyra both belong to the same Subclass of the Rhodophyta. Cryptomonas has two tinsel flagella. Exospores and endospores are produced by some members of the cyanobacteria. Ctenocladus and Dunaliella are two genera of green algae that can survive in aquatic environments of high salinity.