Bibliography

Forest, Herman. Handbook of Algae. Knoxville: UT Press, 1954. Fig 386.

Hayden, F. Department of of Interior U.S. Geological Survey of the Territories. Washington D.C.: Government Print Office, 1879. Plate X.

Pennak, Robert. Fresh-Water Invertebrates of the U.S. 1989 pp. 158, Fig. 35, Fig. 11

Prescott, G.W. The Fresh Water Algae. C. Brown Publishing Co. 1954 Fig 27a

Lunda, Hilda and John Lund. Fresh Water Algae: The Microscopic World Explored. Biopress Limited, 1995. Fig 235.