see text Fragilaria is a genus of freshwater and saltwater diatoms.

It is usually a colonial diatom, forming filaments of cells mechanically joined by protrusions on the face and in the center of their valves.

The individual diatoms appear swollen in their centers where they are joined to the colonial ribbon.

[1] The genus grows as both plankton and benthic species, free living in colonies or as epiphytes.

[3] Fragilaria has been the dominant genus of diatoms in Lake Mývatn in Iceland for at least 1200 years.