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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
D1. Cells form groups of four in rectangular colonies:
Merismopedia
D2. Cells tiny, spherical or oval; cells form single flat layer (not in regular groups of four cells):
Pannus
C2. Colonies comprised of cubical, four-cell subgroups
C3. Colonies approximately spherical
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
