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Key to genera<br />
CELLS SWIM (WITH FLAGELLA)<br />
Unicellular<br />
Colonial<br />
CELLS DO NOT SWIM (NO FLAGELLA, BUT<br />
Unicellular<br />
Green elongated<br />
Green 'chunky'<br />
Yellow or brown<br />
Colonial<br />
Green .<br />
Brown or other colour<br />
Filamentous .<br />
32<br />
—<br />
Section A : single motile cells<br />
Cell with wide envelope enclosing a<br />
smaller protoplast<br />
Envelope + thick and strong, pale<br />
yellow to brown or black<br />
Envelope spherical or flask-shaped,<br />
smooth or ornamented, one<br />
flagellum<br />
Envelope lenticular, patterned, two<br />
flagella .<br />
Envelope thin and delicate, two flagella<br />
Outline lobed .<br />
Outline smoothly oval, not winged .<br />
With longitudinal wings, side view<br />
flattened .<br />
MAY CREEP)<br />
Trachelomonas<br />
Phacotus<br />
Lobomonas<br />
Haematococcus<br />
Pteromonas<br />
Section<br />
Cell without wide envelope, wall fits closely<br />
Chloroplast brownish or yellowish<br />
Cells drop- or heart-shaped . Cryptomonas<br />
Cells lemon- or egg-shaped, sometimes<br />
with long 'tail', often having<br />
hairy appearance due to covering of<br />
scales or spines . . Mallomonas<br />
single Synura cells<br />
A
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