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A1. NONMOTILE ALGAE WITHOUT CHLOROPLASTS:
CYANOBACTERIA
B1. VEGETATIVE CELLS USUALLY SOLITARY
B2. VEGETATIVE CELLS UNITED INTO COLONIES
C1. CELLS ARRANGED IN A SINGLE LAYER FORMING FLAT COLONIES
D1. CELLS FORM GROUPS OF FOUR IN RECTANGULAR COLONIES:
Merismopedia
D2. CELLS TINY (<4 µm), SPHERICAL OR OVAL; BLUE-GRAY, IN SINGLE FLAT LAYER FORMING SPHERICAL, IRREGULAR, OR NET-LIKE (CLATHRATE) COLONIES:
Pannus
C2. CELLS ARRANGED IN CUBICAL COLONIES
C3. CELLS ARRANGED IN SPHERICAL OR NEARLY SPHERICAL COLONIES
C4. CELLS ARRANGED INTO IRREGULAR, AMORPHOUS COLONIES
B3. VEGETATIVE CELLS ALIGNED END-TO-END FORMING FILAMENTS OR PSEUDOFILAMENTS
A2. NONMOTILE ALGAE WITH CHLOROPLASTS
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)
