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A1. Nonmotile algae without chloroplasts:
Cyanobacteriophyta
A2. Motile algae with chloroplasts and flagella
B1. Motile single-cell algae
C1. Cells with one visible flagellum
C2. Cells with two equal length flagella
D1. Cells enclosed in firm, transparant, spherical mucilage
D2. Cells enclosed in rigid lorica
D3. Cells not enclosed in lorica or surrounded by spherical or oval muicilage
E1. Narrowly elliptical or spindle-shaped cells; flagella often directed backwards; cells often nonmotile and embedded in mucilage or other algae:
Chlorogonium
E2. Cells slipper-shaped, oval, teardrop-shaped; asymmetric; two nearly equal flagella inserted below apex (subapical):
Cryptomonads
E3. Spherical, oval, or elliptical cells with two equal flagella inserted at the apex (large, difficult group):
Chlamydomonas
and similar
C3. Cells with two dissimilar flagella
C4. Cells with more than two flagella
B2. Motile colonies with 4 or more cells
A3. Nonmotile algae with chloroplasts but without flagella
A4. Cells with paired, symmetric semi-cells:
Desmids
A5. Cells enclosed in glassy, ornamental frustules:
Diatoms
