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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
D1. CELLS SPHERICAL, OVAL, OR LEMON-SHAPED
D2. CELLS CYLINDRICAL, FUSIFORM, OR NARROWLY ELLIPTICAL
D3. CELLS ASYMMETRIC, BLUNTLY CRESCENT-SHAPED OR SAUSAGE-SHAPED; COLONIES USUALLY CONTAINING 4-8 CELLS SURROUNDED BY GELATINIZED PARENT CELL WALL:
Nephrocytium
D4. CELLS ANGULAR, WEDGE-SHAPED, OR IRREGULAR
C3. COLONIES VARIOUS SHAPES OTHER THAN FLATTENED AND SPHERICAL/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)
