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IOWA ACADEMY OF SCIENCE 
57. Macrosporium solani E. & M. 
On Solanum tuberosum L. 
58. Cercospora apii pastinacae Earl. 
On Pastinaoa sativa L. 
58%. Cercospora angulata Wint. 
On Ribes rubrum L. 
59. Cercospora beticola Sacc. 
On Beta vulgaris L. 
60. Cercospora euonymi Ell. 
On Euonymous antopurpureus Jacq. 
61. Cercospora granuliformis Ell. & Holw. 
On Viola papilionacea Pursh. 
62. Cercospora monoica Ell. & Holw. 
On F ale at a Sp. 
63. Cercospora rhoina C. & E. 
On Rhus glabra L. 
64. Cercospora venturioides Peck. 
On Asclepias syriaca L. 
65. Cercospora vernonieae E. & K. 
On Vernonia fasciculata Michx. 
66. Cercospora avicularis Wint. 
On Poloygonum aviculare L. 
ERYSIPHACEAE. 
67. Sphaerotheca humuli (DC.) Burrill. 
On Rosa Arkansana Porter. This species is not very common. 
68. Sphaerotheca humuli fuliginea (Schlecht), Salmon. 
On Bidens frondo-sa L., B. involucrata (Nutt.) Britton, Eric- 
hitites hieracifolia (L.) Raf., Leptandra virginica (L.) Nutt, 
Taraxacum taraxacum (L.) Karst. This species is very com- 
mon but confined to weeds. 
69. Sphaerotheca pannosa (Wallr.) Lev. 
On Rosa multiflora — especially on the hybrid variety known 
as Crimson Rambler. Docs some damage. 
70. Sphaerotheca mors-uvae (Schwein.) Berk & Curt. 
On Ribes spp. Does considerable damage to cultivated goose- 
berries some years. 
