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A1. NONMOTILE ALGAE WITHOUT CHLOROPLASTS:
CYANOBACTERIA
B1. VEGETATIVE CELLS USUALLY SOLITARY
B2. VEGETATIVE CELLS UNITED INTO COLONIES
B3. VEGETATIVE CELLS ALIGNED END-TO-END FORMING FILAMENTS OR PSEUDOFILAMENTS
C1. CELLS ARE JOINED END-TO-END TO FORM TRICHOMES; TRICHOMES CONTAIN HETEROCYSTS
C2. CELLS ARE JOINED END-TO-END TO FORM TRICHOMES; TRICHOMES DO NOT CONTAIN HETEROCYSTS
C3. CELLS FORM PSEUDOFILAMENTS WHERE INDIVIDUAL CELLS ARE ALIGNED END-TO-END BUT NOT JOINED ACROSS THE END WALL
D1. CELLS NARROWLY ELLIPTICAL, CYLINDRICAL, OR FUSIFORM; COLONIES ELONGATED, SURROUNDED BY BROAD MUCILAGE:
Rhabdoderma
D2. CELLS TINY (width <2 µm), PALE BLUE-GRAY, ROD-SHAPED; FORMING PSEUDOFILAMENTS THAT OFTEN CLUMP INTO SPHERICAL, IRREGULAR, OR NET-LIKE (CLATHRATE) COLONIES:
Cyanodictyon
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)
