• 162 IOWA ACADEMY OF SCIENCES. 



sted.* I am also indebted to Prof. L. H. Pammel who has 

 kindly examined some of the specimens for me. 



In studying this group one easily separates it into three 

 divisions; true parasites, forming distinct spots in living 

 tissues, saphrophytic forms which seem to attack only dead, or 

 languid foliage; facultative, which accommodate themselves to 

 both living and dead tissues. The spores of the second 

 divisioa are somewhat abnormally long and hyaline giving a 

 frosty appearance to the host when present in large numbers. 

 I have arranged the specimens alphabetically. Quite a number 

 have not been definitely determined. Some of these may 

 prove new. 



G. acalyjjhce, Peck. On leaves of Acalypha ostrycefoUa and 

 A. gracilens. No. 89. 



C. agrostidis, Atks. On leaves of Eupatorium verbenfefolium. 

 No. 18. 



C. alabamensis, Atks. Abundant and destructive to the foli- 

 age of Ipomcea purpurea No. 67. 



G. althceina, Sacc. Abundant and destructive to leaves of 

 Althea rosea. No. 68. 



G. ampelopsidis, Pk. On leaves of Ampelopsis quinque folia. 

 No. 32. 



C. apii, Fres., Var. pastinacece, Farl. Very abundant and 

 destructive, completely destroying the foliage of Pastinaca sal- 

 iva. No. 5. 



G. asdepidora, Ell. & Kell. Frequent on the leaves of Ascle- 

 pias tuberosa. No. 80. 



G. atromaculans, E. &. E. On the leaves, stems and fruit of 

 Sassia tora. No. 94. 



G. asimince, E. &. K. Abundant and destructive to leaves of 

 Asimlna sp. No. 62. 



G. beticola, Sacc. Destructive to leaves of Beta vulgaris. 

 No. 43. 



G. boleana, (Thuem.) Speg. Seriously injuring the leaves of 

 Ficus carica. No. 3. 



G. brunklii, Ell & Gall. Abundant on leaves of Pelargonium 

 graveolens. No. 99. 



G. callicarpae, Cke. Abundant and destructive to leaves of 

 Gallicarpa americana. No. 15. 



G. canescena, E. & M. Very abundant on the leaves, stems 

 and fruit of Phaseolus vulgaris. No. 13. 



• Halsted, BuU Dept. of Bot. la. State OoU. 1888: 102-llT. 



