Abstract
Morphological variation in 30 isolates of Achlya caroliniana Coker and 19 isolates assigned to A. flagellata Coker is described. Isolates of A. caroliniana agreed closely in their morphology with descriptions from elsewhere, but the group of isolates assigned to A. flagellata did not agree exactly with any described species; they are closest to A. flagellata and A. proliferoides Coker. It is suggested that the species A. proliferoides be included in the same specics complex as A. flagellata.