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A1. Nonmotile algae without chloroplasts:
Cyanobacteriophyta
B1. Vegetative cells usually solitary
C1. Cells attached to aquatic plants (epiphytic)
D1. Solitary elongated basal cell enclosed in open sheath, often with one or more exocytes (reproductive cells):
Chamaesiphon
D2. Solitary short basal cell enclosed in an open ended sheath, usually with many exocytes (reproductive cells):
Stichosiphon
D3. Solitary elongated basal cell (not in sheath), usually with one or more exocytes (reproductive cells):
Cyanophanon
D4. Solitary short, club-shaped basal cell with only one exocyte (reproductive cell):
Geitleribactron
C2. Cells solitary unless dividing; not epiphytic:
Cyanothece
C3. Cells solitary or in small colonies; colonies usually formed from 2-4 cell subgroups:
Chroococcus
C4. Thick walled resting cells:
akinetes
B2. Vegetative cells united into colonies or agglomerations
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
