t systematic implications. The globose
morphology of treated cells does not coincide with the original
description of the genus Phacus made by Dujardin (1841), who
described these cells as rigid and more or less flattened, nor with
the posterior description of Marin et al. (2003), who amended this
diagnosis, specifying once again that the cells are laterally compressed.
Only recently, on the basis of molecular evidences