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Transmission electron microscopy was used to examine the ultrastructure aspects of cyanophage SM‐2 replication in its host Synechococcus elongatus Naegeli UTEX 563. Filled virion heads were observed 10 h after infection, correlating well with the 6–8 h eclipse period for the virus. As the infection cycle proceeded from 10–50 h, additional virion heads accumulated at either end of the nucleoplasm. Of the several cyanophage that lyse unicellular bluegreen algae, this is unique to the SM‐2 system. The surrounding photosynthetic lamellae remained intact throughout the infection cycle. The nucleic acid composition of SM‐2 was determined as DNA.

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