What is colony?

Colony is a visible group or growth of microorganisms on a solid medium, presumably arising from a single microorganism.
mucoid c., M-type c. A usually virulent colony marked by a well developed carbohydrate capsule which may act as a defense mechanism.
rough c., R-type c. A nonvirulent or slightly virulent colony having a granular growth, irregular margins, and flat surface.
smooth c., S-type c. A colony presenting a round, even, smooth surface; some capsule-forming species have a degree of virulence.

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