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A1. NONMOTILE ALGAE WITHOUT CHLOROPLASTS:
CYANOBACTERIA
A2. NONMOTILE ALGAE WITH CHLOROPLASTS
B1. CELLS USUALLY SOLITARY
B2. NONMOTILE COLONIES WITH TWO OR MORE CELLS
C1. CELLS FLATTENED, FORMING RIBBON-LIKE CHAINS, SHORT CYLINDERS, OR PLATE-LIKE GROUPS OF CELLS
C2. COLONIES SPHERICAL OR OVAL
C3. COLONIES VARIOUS SHAPES OTHER THAN FLATTENED AND SPHERICAL/OVAL
D1. CELLS ENCLOSED IN RIGID VASE-LIKE OR CYLINDRICAL LORICA:
Epipyxis
D2. CELLS SPHERICAL OR BROADLY OVAL
D3. CELLS CLUB-SHAPED, FUSIFORM, CYLINDRICAL, CRESCENT-SHAPED, OR SPINDLE-SHAPED (NOT SPHERICAL OR OVAL)
B3. FILAMENTOUS ALGAE (INCLUDING PSEUDOFILAMENTS)
B4. CELLS ATTACHED TO ZOOPLANKTON (EPIZOIC), LIVING INSIDE ZOOPLANKTON OR OTHER AQUATIC ANIMALS (ENDOZOIC), OR ATTACHED TO AQUATIC PLANTS (EPIPHYTIC)
A3. MOTILE ALGAE WITH CHLOROPLASTS AND FLAGELLA
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)
