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Foreword
The purpose of this guide is to enable a non-specialist to
identify most of the algae occurring in the plankton of rivers.
In addition it will be found helpful in identifying algae in
canals, broads and lowland pools, the plankton of which
contains many of the same organisms.
We hope to produce a future guide including the commoner
benthic diatoms of rivers. A few of these, present frequently
in the plankton during periods of high rate of flow, have
been included in the present publication.
Many readers, in search of a name, will want to look at the
pictures first, hence these are placed before the key and
descriptions. Numbers following the names opposite the
plates refer to page numbers of the descriptions.
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