New records of Vaucheria species (xanthophyceae) with associated Proales werneckii (rotifera) from North America

The presence of galls on species of Vaucheria was investigated both seasona lly and in a number of locations in North America. These galls are induced by the rotifer, Proales werneckii. In an Ohio stream, Vaucheria bursata and V. geminata were found to have galls throughout their growing season; Sept ember to January. Galls were most abundant in October and ranged in size fr om 90-260 mu m in width and 140-790 mu m in length. New records of Vaucheri a with galls from locations in Alabama, California, Georgia, Louisiana, Nor th Carolina, Ohio and Tennessee are reported. Three of the five taxa collec ted were not previously known to contain galls. In addition, worldwide lite rature on the distribution of these associated taxa was reviewed. (C) ADAC / Elsevier, Paris.