Annual report of the North Carolina Agricultural Experiment Station . the eye-piece which constituted in most cases as small aunit as could be used to advantage. Spore measurements involving half thedivision were recorded as with the next lower interval. To avoid any pos-sibility of unconscious selection, the spore lying closest to contact with the endof the micrometer scale at the completion of a measurement was taken for thenext measurement. In the polygons each small square (one 256th of a square inch) repre-sents one spore. We wish to acknowledge our indebtedness to Dr. G. H. Shull
Annual report of the North Carolina Agricultural Experiment Station . the eye-piece which constituted in most cases as small aunit as could be used to advantage. Spore measurements involving half thedivision were recorded as with the next lower interval. To avoid any pos-sibility of unconscious selection, the spore lying closest to contact with the endof the micrometer scale at the completion of a measurement was taken for thenext measurement. In the polygons each small square (one 256th of a square inch) repre-sents one spore. We wish to acknowledge our indebtedness to Dr. G. H. Shull, who has kindlyread this portion of the manuscript, for calculating the constants; to B. Higgins. by whom most of the measurements were made and upon whosevery accurate and painstaking work the value of the measurements depends. Ascochyta Chrysanthemi Stevens. A. Spores from the large pycnidiumtype (see page 59). Pycnidium No. 1. A large pycnid-ium produced in a colony which hadvery few pycnidia. M= + .9787 + V = + n=284. Fig. 16.—Ascochyta Chrysanthemi of spores from pycnidium No. 1, largetype. 3 should cover 20 squares instead of 25. division equal jjl. VARIATION OF FUNGI DUE TO ENVIRONMENT. Pycnidium No. 2. Large type.
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