Environmental Engineering Reference
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50 μm
10 μm
Figure 4.59
Auliscus.
Surface view of frustule, show-
ing ocelli (arrow). Prepared slide.
10 μm
Figure 4.58
Stephanodiscus
. Centric diatom. Top:
Live planktonic cell, with numerous discoid chloroplasts
and a frustule with clear marginal spines (arrows). Bot-
tom: Acid digest, lake sediment sample - showing radi-
ating rows of fine punctae.
25 μm
Figure 4.60
Aulacodiscus.
Valve view showing cen-
tral areolate pattern of frustule. Acid digest, lake sedi-
ment sample.
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