Chlorophyta; Greens
Cladophora sp. - multicellular, branched, filamentous green found in freshwater and marine habitats

Picture Source: Ohio University Algal Home Page; Dr. Morgan Vis

Hydrodictyon sp. - known as water net, cells are elongated and coenocytic (multinucleate cells without cross-walls)

Picture Source: Ohio University Algal Home Page; Dr. Morgan Vis

Volvox sp. - colony of algal cells, usually 500 or more, cells are biflagellated with the colony moving (swimming) as a unit.  The spaces between the cell is filled with water and mucilage.  The large cells inside are daughter colonies formed by cell divisions (asexual reproduction).  Eventually colony ruptures releasing the daughter colonies.

Picture Source: Ohio University Algal Home Page; Dr. Morgan Vis

Cyanophyta; Blue-green
Anabaena sp. - note string of beads formation.  Should see some thickened cells in lab called heterocysts.  These heterocysts fix nitrogen.

Picture Source: Ohio University Algal Home Page; Dr. Morgan Vis