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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 4x in rectangular colonies:
Merismopedia
D2. Cells tiny (<4 µm), spherical or oval; blue-gray, in single flat layer; colonies spherical, irregular, or net-like (clathrate):
Pannus
C2. Colonies comprised of cubical, 4-cell subgroups
C3. Colonies spherical, oval, or amorphous (irregular) in shape
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
