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A1. Nonmotile algae without chloroplasts:
Cyanobacteriophyta
A2. Motile algae with chloroplasts and flagella
A3. Nonmotile algae with chloroplasts but without flagella
B1. Cells usually epiphytic, epizoic, or endozoic
B2. Nonmotile solitary and colonial algae; cells not (or usually not) epiphytic, epizoic, or endozoic
B3. Nonmotile algae that form filaments or pseudofilaments
C1. Unbranched filamentous algae
C2. Branched filamentous algae
D1. Cells very large; filaments coarse, unbranched or very sparsely branched; one genus lacks cellular crosswalls
D2. Filaments with similar cells forming primary and secondary branches; filaments may have dissimilar terminal cells and slightly larger main branch cells
D3. Filaments with distinctly larger primary branches and smaller secondary branches
A4. Cells with paired, symmetric semi-cells:
Desmids
A5. Cells enclosed in glassy, ornamental frustules:
Diatoms
