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A1. NONMOTILE ALGAE WITHOUT CHLOROPLASTS:
CYANOBACTERIA
A2. NONMOTILE ALGAE WITH CHLOROPLASTS
A3. MOTILE ALGAE WITH CHLOROPLASTS AND FLAGELLA
B1. MOTILE COLONIES WITH TWO OR MORE CELLS
C1. CELLS WITH TWO EQUAL FLAGELLA
D1. FLAT COLONIES WITH 4-16 SPHERICAL OR OVAL CELLS:
Gonium
and
Tetrabaena
D2. SPHERICAL, OVAL, OR ELLIPTICAL COLONIES (NOT FLAT)
E1. SPHERICAL COLONIES WITH 16-32 COMPRESSED, WEDGE-SHAPED CELLS:
Pandorina
E2. SPHERICAL COLONIES WITH 16-32 WELL-SEPARATED SPHERICAL CELLS:
Eudorina
E3. LARGE COLONIES WITH MORE THAN 250 TINY CELLS:
Volvox
E4. LARGE COLONIES WITH 32-128 CELLS; LARGE AND SMALL CELLS ON OPPOSITE HEMISPHERES:
Pleodorina
C2. CELLS WITH TWO DISSIMILAR FLAGELLA
B2. MOTILE SINGLE-CELL ALGAE
A4. CELLS DIVIDED INTO MIRROR-IMAGE SEMI-CELLS:
Desmids
(see key at
cedar.wwu.edu/cedarbooks/14/
)
A5. CELLS ENCLOSED IN GLASSY, ORNAMENTAL FRUSTULES:
Diatoms
(see key at
diatoms.org)
