Abstract
Micrococcus cyaneus (strain CCM 856) was studied by electron microscopy of thin sections. The cells exhibit different forms (spherical, flattened and pear-shaped) varying in size from 0.6 to 1.1 μm. The cell wall consists of one layer 40 to 60 nm thick, the surface of which is covered with, or expands as, a fuzzy material. The cytoplasmic membrane has an asymmetric triple-layered structure with a thickness varying from 8 to 10 nm, and infolds into the cytoplasm as intracytoplasmic membrane systems with configuration, size and number dependent on the fixation conditions. The shape and arrangement of the cells of M. cyaneus differs from that of other micrococci and therefore its taxonomic status should be re-evaluated.
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