- Zygnema contains
about 120 species, 38 of
- which are found in North America. The genus
is widespread and sometimes abundant in freshwater ditches, ponds,
and lakes of neutral or slightly acidic pH. Some species inhabit
the flowing waters of streams; the flexible filaments move easily
with the water current. Other species may be part of
- the benthic or floating metaphytic communities
of acidified lakes. Zygnema is often found with Spirogyra
and Mougeotia.
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