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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
C2. CELLS ARRANGED IN CUBICAL COLONIES
D1. SMALL SPHERICAL CELLS IN DENSE, CUBICAL COLONIES:
Eucapsis
D2. CELLS IN GROUPS OF 2 OR 4; COLONIES OCCASIONALLY CUBICAL BUT USUALLY IN AMORPHOUS:
Chroococcus
D3. CELLS FORMING CUBICAL, SPHERICAL, OR IRREGULAR SUBGROUPS WITHIN LARGER COLONIES:
Microcystis
(in part)
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)
