EXTRAORDINARY ORGANISMS—The cyanobacterium, Trichodesium thiebautii, form filaments (bottom image) that contain many individual disk-shaped cells, each about 15 micrometers (10-6 meters) wide. Hundreds of T. thiebautii filaments join to create a macroscopic colony about 2.0 millimeters (10-4 meters) in diameter (top image). (Photos by John Waterbury, WHOI)[back]
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