Pseudokephyrion klarnetii, P. pseudospirale, P. ovum, P. ellipsoideum and an unnamed species figured by Williams (1933) are recorded and described. The records of sexuality in such algae are reviewed and the similarity between this and asexual budding considered. The taxonomic histories of Kephyrion, Pseudokephyrion, Kephyriopsis and Stenocalyx are summarized. A consideration of the characters utilized by various authors leads to the conclusion that until these algae are better known their generic limits must be uncertain. Specific limits can be clearer, particularly if sexually reproducing populations are found.