SUMMARYThe life cycle of several clones ofPhaeoschizochlamys mucosa, Tetrachrysis minorspec. nov., andChrysosphaera botryoidesspec. nov. is described. Zoids were found to occur in the life cycle ofPhaeoschizochlamys;as a consequence, this genus is removed from the subclass Acontochrysophycidae to the Heterochrysophycidae, order Chromulinales. The newTetrachrysisspecies differs from the type species in this genus in mode of cell division and its copious mucilage investment; its systematic position is discussed. The newChrysosphaeraspecies differs from other algae in this genus in that it hasOchromonas‐like zoids instead of theChromulinatype described for the genusChrysosphaer