CONTRIBUTION TO THE DINOFLAGELLATE FLORA OF OHIO

Water samples were collected from over 100 sites in Ohio in a survey f or dinoflagellates. Whole water and tows were taken from ponds, lakes, and reservoirs. Approximately half the samples contained dinoflagella tes and 24 taxa were identified including 13 not previously reported f rom Ohio. New taxa include Ceratium brachyceros, Peridinium umbonatum, Peridinium volzii, Thompsodinium intermedium, Peridiniopsis cunningto nii, Cystodinedria inermis, Gymnodinium austriacum, G. hiemale, and G. wawrikae. Four of the published forms of Ceratium hirundinella were r ecognized including forma silesiacum, forma piburgense, forma scotticu m, and forma gracile.