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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
C3. CELLS ARRANGED IN SPHERICAL OR NEARLY SPHERICAL COLONIES
C4. CELLS ARRANGED INTO IRREGULAR, AMORPHOUS COLONIES
D1. CELLS APPEAR BROWN AND MOTTLED UNDER MICROSCOPE
E1. CELLS SPHERICAL OR OVAL; DISTRIBUTED THROUGHOUT COLONY (NOT FORMING SINGLE LAYER AROUND HOLLOW COLONY CENTER), WITH SOME SPECIES FORMING CUBICAL SUBGROUPS; COLONY SPHERICAL OR IRREGULAR (AMORPHOUS):
Microcystis
E2. CELLS FORM AT END OF THICK, RADIATING MUCILAGE STRANDS THAT ARE RARELY VISIBLE; COLONIES INITIALLY SPHERICAL, BECOMING IRREGULAR WITH AGE:
Woronichinia
D2. CELLS DO NOT APPEAR BROWN AND MOTTLED UNDER MICROSCOPE
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)
