Abstract
An unnamed species of the unicellular planktonic alga Ankyra (Chlorophyceae, Chlorococcales), isolated from the English Lake District and maintained in clonal culture, has been examined morphologically by light and electron microscopy, and an account of its microanatomy prepared. Features of interest include a pair of leaf-like appendages at the anterior end of the fusiform cell, and the pyrenoid which is penetrated by cytoplasmic membrane-lined canals similar to those described for the flagellate Platymonas (Prasinophyceae).