Title: Not quite as outdated as the rest of Drouet's work.
Product review: This was the fourth part of Drouet's revision of the Cyanobacteria. He was a botanist of the old school, and he lumped most of the existing genera and species together because he believed that most of the morphological diversity in this group was due to different environmental conditions and not to genetic diversity. This belief was based on unpublished data, so most researchers, botanists included, ignored his work. Some great drawings. May be of interest to researchers of this obscure group of Cyanobacteria because it is one of the few studies comparing them.
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