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Species in the genus
Euastrum are
somewhat similar to
those in Cosmarium
but have a more
irregular outline and a
small notch at each
end (polar notch) (Fig.
7, top left). The out-of-
focus central area of
each semi-cell in Fig. 7
top left are
characteristic swellings
on the faces of the
semi-cells.
The irregular cell
border is even more
extreme is species in
the genus
Micrasterias where
each of the two semi-
cells is deeply notched
(Fig. 7)
Fig. 7. Euastrum (top left),
and 4 specimens
of Micrasterias
