Prostrate

The growth habit of lying flat, firmly attached by mucilage to a surface. Example surfaces include rocks, filamentous algae, macrophytes, and even other diatoms.

Prostrate
Image Credit: Sarah Spaulding
Scanning electron micrograph of live cells of Cocconeis placentula growing on a rock. Note the mucilage pads on some of the cells. This diatom has a prostrate growth habit.