SUMMARY
1. | Isolations were attempted with ascospores from perithecia of 43 collections of species of Pleospora, Clathrospora, and Leptosphaeria.
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2. | The characters of the different isolates in culture were sufficiently distinct to permit the recognition of the individual species insofar as the isolates used were concerned. | ||||||||||||||||||||||
3. | Identification of the conidial stages of Clathrospora diplospora, of C. Elynae, and of Leptosphaeria heterospora by means of commonly accepted descriptions necessitated their placement in the form-species Alternaria tenuis. | ||||||||||||||||||||||
4. | Statistical analyses of conidial lengths observed in strains of Clathrospora diplospora, of C. Elynae, and of Leptosphaeria heterospora indicated that, under certain environmental conditions, the strains studied of each of the species could be differentiated from each of the other two. | ||||||||||||||||||||||
5. | Nutrient differences in media upon which the Alternaria strains were grown resulted in a greater percentage of statistical differences in comparisons among the strains than did pH or age differences. |