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Prostrate

Primary side

Protracted

Many algae live attached firmly to a surface, such as rocks, macrophytes or other substrates. Species that 'lie flat' and are affixed to a surface are considered to have a prostrate habit of growth.

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.