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A1. NONMOTILE ALGAE WITHOUT CHLOROPLASTS:
CYANOBACTERIA
B1. VEGETATIVE CELLS USUALLY SOLITARY
C1. CELLS ATTACHED TO AQUATIC PLANTS (EPIPHYTIC)
D1. SOLITARY ELONGATED BASAL CELL ENCLOSED IN AN OPEN ENDED SHEATH, OFTEN WITH ONE OR MORE EXOCYTES (REPRODUCTIVE CELLS):
Chamaesiphon
D2. SOLITARY SHORT BASAL CELL ENCLOSED IN AN OPEN ENDED SHEATH, USUALLY WITH NUMEROUS EXOCYTES (REPRODUCTIVE CELLS):
Stichosiphon
D3. SOLITARY ELONGATED BASAL CELL (NOT IN SHEATH), USUALLY WITH ONE OR MORE EXOCYTES (REPRODUCTIVE CELLS):
Cyanophanon
D4. SOLITARY SHORT, CLUB-SHAPED BASAL CELL, WITH ONLY ONE EXOCYTE (REPRODUCTIVE CELL). ALTHOUGH TECHNICALLY SOLITARY, THE CELLS MAY FORM A DENSE CLUMP ON AQUATIC VEGETATION:
Geitleribactron
C2. CELLS SOLITARY UNLESS DIVIDING; NOT EPIPHYTIC:
Cyanothece
C3. CELLS SOLITARY OR IN SMALL COLONIES; COLONIES USUALLY FORMED FROM 2-4 CELL SUBGROUPS:
Chroococcus
C4. THICK WALLED RESTING CELLS:
akinetes
B2. VEGETATIVE CELLS UNITED INTO 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)
