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A1. Nonmotile algae without chloroplasts: Cyanobacteriophyta
B1. Vegetative cells usually solitary
C1. Thick walled resting cells:
akinetes
C2. Cells broadly oval or spherical; solitary unless dividing:
Synechocystis sallensis
C3. Cells occasionally appear to be solitary, but are usually in small 2-4 cell groups:
Chroococcus
B2. Vegetative cells united into colonies or agglomerations
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
