Further observations on the type species of Pyramimonas (P. tetrarhynchus Schmarda) (Prasinophyceae): an examination by light microscopy, together with notes on its taxonomy

Previous records of Pyramimonas tetrarhynchus are examined, and a morphological variant is designated as var.lobata var.nov. The species was studied by light microscopy using cultured material, as a supplement to investigations with the electron microscope published separately. Particular attention was paid to aspects of cell symmetry at various stages of division.