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A1. Nonmotile algae without chloroplasts: Cyanobacteriophyta
B1. Vegetative cells usually solitary
B2. Vegetative cells united into colonies or agglomerations
B3. Vegetative cells aligned end-to-end forming filaments or pseudofilaments
C1. Trichomes with heterocysts (heterocytes) at one or both ends (basal) or along the trichome (intercalary)
C2. Trichomes lack heterocysts at all stages of development
D1. Trichomes are spiralling or coiled and usually highly motile:
Arthrospira
and
Spirulina
D2. Multiple trichomes enclosed in a wide, common mucilage:
Microcoleus
D3. Cell width considerably shorter than length; cells often coin-like
D4. Cell width greater than or equal to length; cells cubical, cylindrical, or oval
C3. Vegetative cells aligned end-to-end, but not joined along the endwall (pseudofilaments)
A2. Nonmotile algae with chloroplasts
A3. Motile algae with chloroplasts and flagella
A4. Cells divided into paired semi-cells that are approximate mirror images of each other:
Desmids
A5. Cells enclosed in glassy, ornamental frustules; many species exhibit gliding movement:
Diatoms
