Structure and reproduction ofSphaeroplea fragilissp.nov., a new member of the Sphaeropleaceae (Chlorophyceae) from California

摘要

A new species ofSphaeropleais described from material collected near Lemoncove, California.Sphaeroplea fragilissp.nov. possesses a combination of features that clearly support its status as a distinct member of the Sphaeropleaceae. These features include the production of vegetative filaments that fragment easily, the presence of numerous and relatively long cytoplasmic plugs (4 ndash; 400ensp;mu;m), precocious sexual development, the production of short antheridia (21 ndash; 141ensp;mu;m), a highly variable ornamentation of the oospore wall, and the occasional production of cirri, which are curled appendages on the oospore wall.