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A1. Nonmotile algae without chloroplasts: Cyanobacteriophyta
B1. Vegetative cells usually solitary
B2. Vegetative cells united into colonies or agglomerations
C1. Cells arranged in a single layer to form flat colonies
C2. Colonies comprised of cubical, four-cell subgroups
C3. Colonies approximately spherical
D1. Cells form tangled filaments enclosed in spherical or nearly spherical mucilage:
Nostoc
D2. Cells appear mottled brown when viewed under the microscope
E1. Cells spherical or oval, distributed throughout colony (not in a single layer around hollow colony center):
Microcystis
E2. Spherical or hemispherical colony comprised of filaments radiating from common center:
Gloeotrichia echinulata
E3. Cells arrached in single layer on outer perimeter of a hollow colony:
Woronichinia naegeliana
D3. Cells various colors but not mottled brown when viewed under the microscope
C4. Cells arranged into irregular, amorphous colonies
B3. Vegetative cells aligned end-to-end forming filaments or pseudofilaments
A2. Nonmotile algae with chloroplasts
A3. Motile algae with chloroplasts and flagella
A4. Cells divided into paired semi-cells that are approximate mirror images of each other:
Desmids
A5. Cells enclosed in glassy, ornamental frustules; many species exhibit gliding movement:
Diatoms
