Ulothrix species are unbranched filamentous green algae. The cells are typically about as broad as they are long (or broader). The chloroplast is a ring which runs around all or part of the circumference of the cell, and occupies almost its whole length. They grow attached to surfaces by a modified holdfast cell.

Reproduction is mainly vegetative. The cell contents become densely coloured, then divide into several spherical zoospores which escape through a hole or tube in the cell wall: see the 2nd 3rd and 6th images.

ILLUSTRATIONS:

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John Kinross