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aDivision of Soil Microbiology, Bureau of Plant Industry, United States Department of Agriculture
1
Contribution from the Laboratories of Cryptogamic Botany and the Farlow Herbarium, Harvard University, No. 171. A portion of the results here reported were included in a thesis submitted by the senior author to the faculty of Harvard University, June 1936, in partial fulfillment of the requirements for the degree of doctor of philosophy in biology.