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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
D2. CELLS DO NOT APPEAR BROWN AND MOTTLED UNDER MICROSCOPE
E1. CELLS SPHERICAL OR OVAL
F1. CELLS SMALL (≤3 µm), SPHERICAL OR OVAL, BLUE-GRAY, IN SINGLE FLAT LAYER FORMING SPHERICAL, IRREGULAR, OR NET-LIKE (CLATHRATE) COLONIES:
Pannus
F2. CELLS FORM AT END OF THICK, RADIATING MUCILAGE STRANDS; MOST COMMON SPECIES IS DARK MOTTLED BROWN:
Woronichinia
(in part)
F3. COLONIES COMPRISED OF 2--16 CELL SUBGROUPS (USUALLY 4X); DIFFICULT, DIVERSE, AND INCOMPLETELY DESCRIBED GROUP:
Chroococcus
and
Limnococcus
F4. CELLS LOOSELY DISTRIBUTED IN AMORPHOUS OR SPHERICAL COLONIES, USUALLY SURROUNDED BY DIFFUSE MUCILAGE; USUALLY NOT IN SUBGROUPS OF 4X:
Aphanocapsa
F5. CELLS IN SUBGROUPS OF 2 OR 4, SURROUNDED BY THICK, STRIATED MUCILAGE:
Gloeocapsa
and
Gloeothece
E2. CELLS ELLIPTICAL, ROD-SHAPED, CYLINDRICAL, OR FUSIFORM
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)
