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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)
D1. Trichomes unbranched
D2. Trichomes with false branching
D3. Trichomes form true branches; main trichome usually multiseriate (more than one cell wide):
Stigonema
C2. Trichomes lack heterocysts at all stages of development
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
