SUMMARY
A new species of Achlya, A. crenulata, is described. It differs primarily from other eccentric species of Achlya in that its spherical oogonia are covered with blunt crenulate projections. The fungus was grown in several media: 0.05% haemoglobin with 0.2% potassium phosphate gave the best vegetative growth. A solution of 0.05% leucin with 0.1% calcium, phosphate restricted the vegetative growth but after 120 hours in fresh water antheridia were more profusely formed than in any other solution.