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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
B2. MOTILE SINGLE-CELL ALGAE
C1. CELLS WITH ONE VISIBLE FLAGELLUM
C2. CELLS WITH TWO EQUAL LENGTH FLAGELLA
D1. CELLS ENCLOSED IN FIRM, TRANSPARANT, SPHERICAL MUCILAGE LAYER
D2. CELLS ENCLOSED IN RIGID LORICA
E1. CELLS ENCLOSED IN A ROUGH, REDDISH BROWN LORICA; LORICA SEPARATES ALONG TRANSVERSE (EQUATORIAL) GROOVE:
Hemitoma
E2. CELLS CIRCULAR IN FACE VIEW; LENS-SHAPED IN SIDE VIEW; ENCLOSED IN TRANSPARENT OR YELLOWISH, GRANULAR LORICA; LORICA SEPARATED ALONG LONGITUDINAL GROOVE:
Phacotus
D3. CELLS NOT ENCLOSED IN LORICA OR SURROUNDED BY SPHERICAL OR OVAL MUCILAGE
C3. CELLS WITH TWO DISSIMILAR FLAGELLA
C4. CELLS WITH MORE THAN TWO 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)
