Annual report of the North Carolina Agricultural Experiment Station . T. 49 With two of these septorias, thick plating, other conditions being the same,so changed their character that not only would the species be considered asdifferent, but the fungus would be shifted from the Sphaeropsidales to theffyphomycetales (Hyplaesa of Saccardo). A similar change of habit is well known in the genus Fusarium, which inculture, crowded or not. often abandons acervulus formation, thus changingits systematic position from the Tiiberculariaccae to the Mucedinaceae: Thegenera Collet of riclium and Gloeosporu
Annual report of the North Carolina Agricultural Experiment Station . T. 49 With two of these septorias, thick plating, other conditions being the same,so changed their character that not only would the species be considered asdifferent, but the fungus would be shifted from the Sphaeropsidales to theffyphomycetales (Hyplaesa of Saccardo). A similar change of habit is well known in the genus Fusarium, which inculture, crowded or not. often abandons acervulus formation, thus changingits systematic position from the Tiiberculariaccae to the Mucedinaceae: Thegenera Collet of riclium and Gloeosporum similarly abandon acervulus forma-tion and thus suffer still greater taxonomic disturbance by moving from theMelaitconialcs to the Hypliomyeetales. Ascochyta cJirysanthemi Stevens, from chrysanthemum. This fungus was plated January 12. 1907. Myriads of pycnidia were presentfour days later; thick plating caused no inhibition of pycnidial formation, nonaked spores and no constant effect upon the number of pycnidia produced. Volutella fructi S. & H., from Fig. 4.— Volutella fructi S. and H., showing colonies on thinly sown plate culture. Thinly sown, the colonies were large, of indeterminate growth, showing darkcenters with pale borders I Fig. 4) ; thickly sown, growth was inhibited andtheir characters lost. (Fig. 5.) Spermoedia paspali Fries, from paspalum. Spores of this fungus were sown January 19, 1907, in plates giving colonydensities of 90. .14. 30. 14 and 1 per scpiare mm. At all of these densities germination was practically 100 per cent andgrowth proceeded equally in all plates during the early stages. On February4 50 THIRTY-SECOND ANNUAL REPORT, 1909. 11 it was noted that all colonies which came nearly in contact were then stopped. In the plates bearing only one spore per square mil-limeter the colonies continued to enlarge slowly and to produce many sporesin the central portion, though remaining white, not attaining the usual yellowcolor. Deep
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