Publication Date


Document Type


First Advisor

Lynch, Darrel L.||Grosklags, James H.

Degree Name

M.S. (Master of Science)


Department of Biological Sciences




Pure cultures of Coelastrum microporum Naeg. strain (280) and strain (28l) and C. proboscideum Bohlin v. dilatatum Vischer (282) and v. gracile Vischer (184) exhibit a wide degree of variation in their ability to utilize organic substrates when grown under heterotrophic conditions. At 20° C. glucose produces maximum growth of all four algae. At 35 C. lactose produces maximum growth. Several other sugars also surpass glucose as a growth stimulant at this temperature except for C. microporum (280) whose growth is inhibited on all media at the higher temperature. When grown in the various organic media all four algae exhibited considerable morphological fluctuation. C. microporum (280) frequently falls to form coenobia, and in cultures of strain (281) coenobia are rarely seen. C. proboscideum v. dilatatum (282) is able to assume the morphological characteristics of C. microporum in all media that stimulate luxuriant growth. In fructose media it may resemble C. sphaericum Naeg. Only in lactose media were numerous typical coenobia formed. In nitrogen deficient media typical coenobia and coenobia resembling C. cubicum Naeg. were very common. C. proboscideum v. gracile (184) is similar to C. microporum (28l) in that it rarely forms coenobia. The few coenobia that do form in the various media resemble C. microporum. Only in nitrogen deficient media were typical coenobia observed.


Includes bibliographical references.||Includes illustrations.


viii, 53 pages




Northern Illinois University

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