Abstract
The blue-green bacteria have been called by the vernacular name cyanobacteria for some time, and an order Cyanobacteriales Stanier in Gibbons and Murray 1978 seems the most appropriate name for them. Validation of this name is requested even though there is no corresponding genus in the order. As the-International Code of Nomenclature of Bacteria, 1976 revision, does not specify specific endings for taxa above the rank of order, validation of the neuter plural nouns Photobacteria and Scotobacteria for the new classes proposed by Murray and Gibbons 1978 is requested.

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