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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, 4-cell subgroups
C3. Colonies spherical, oval, or amorphous (irregular) in shape
D1. Cells form tangled filaments enclosed in spherical or nearly spherical mucilage:
Nostoc
D2. Cells appear mottled brown when viewed under the microscope
D3. Cells various colors but not mottled brown when viewed under the microscope
E1. Cells attached to radiating mucilage strands
E2. Cells not attached to radiating mucilage strands
B3. Vegetative cells aligned end-to-end forming filaments or pseudofilaments
A2. Motile algae with chloroplasts and flagella
A3. Nonmotile algae with chloroplasts but without flagella
A4. Cells with paired, symmetric semi-cells:
Desmids
A5. Cells enclosed in glassy, ornamental frustules:
Diatoms
