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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
C1. Cells, colonies, filaments or pseudofilaments attached to aquatic plants (epiphytic)
D1. Colonies parasitic on tree pollen; cells pyramidal, with short apical spine, often lacking chlorophyll; cells joined by short extensions to form open, spherical colony: Ducellieria
D2. Protoplast (living portion of cell) enclosed in rigid lorica
D3. Protoplasts (living portion of cell) not enclosed in rigid lorica; cell wall may be rigid or flexible
C2. Cells, colonies, filaments or pseudofilaments attached or associated with or attached to aquatic animals (epizoic)
C3. Chlorella-like cells living inside zooplankton and other aquatic animals (endozoic): Zoochlorella group
B2. Nonmotile solitary and colonial algae; cells not (or usually not) epiphytic, epizoic, or endozoic
B3. Nonmotile algae that form filaments or pseudofilaments
A4. Cells with paired, symmetric semi-cells: Desmids
A5. Cells enclosed in glassy, ornamental frustules: Diatoms