Hoek, Mann and Jahns system
A system of taxonomy of algae, the Hoek, Mann and Jahns system was published inDivision Cyanophyta (= Cyanobacteria)
In a note added in proof, an alternative classification is presented for the class Chlorophyceae:
Many examples of genus given in the book could not be assigned to one of these classes, because the ultrastructural characteristics needed for their classification have not yet been studied.
