The row of cells in a filament of Cyanophyta is the trichome while trichome with the enclosing mucilagenous sheath is the filament.

The stalks of the trichome are septate. The trichomes (pubescences) that often cover the plant body are the result of divisions of epidermal cells.

yes, but the proper term for the "hairs" is a trichome

While Anabaena is an algae, it is only slightly mobile. Its only way of moveing is through a gliding type movement. This movement is caused by waves of propulsion across the entire trichome. ( trichome is a small hair or other outgrowth from the epidermis of a plant, typically has only one cell.)

There are normally three cells within a plant hair but usually, the number of cells depend on the size and the height of the plant hair. Sometimes, there are six cells in a mature hair.