146 IOWA ACADEMY OF SCIENCES. 



8. Mor8-uvae (Schw.) Berk & Curt. 



Abundant on Ribes Grossulariae, R. floridum, June, July; 

 leaves, stem and fruit. 

 Phyllactinia suffulta (Reb.), Sacc. 



Abundant on Fraxinus Americana, August and September. 

 Uncinula necator (Schw.) Burrill. 



Common on Vitis Labrusca, Concord, Worden and especi- 

 ally Roger hybrids (Agawam). 

 MicrospTicera Alni (D. C ) Wint. 



Abundanton Syringa vulgaris, S. Persica, Lonicera, August 

 and September. Abundant latter part of August and 

 September. 

 Erysiphe Cichoracearum D. C. 



Very abundant on Helianthus annuus, H. tuberosus. Not 

 so common on H. grosseserratus. Abundant on Ambro- 

 sia artemisiaefolia, A. trifida, Artemisia, Ludoviciana; 

 generally attacked by Cicinnobulus Cesatii. Abundant 

 on Verbena stricta; less common on V. hastata. 

 E.> communis (Wallr.) Schl. 



Abundant on Rannuculus abortivus and Amphicarpasa 

 monoica. 



SPH^RIACE^E. 



Physalospora Bldwellii (Ell. ) Sacc, 

 None observed in 1895. 



DOTHIDEACE^E. 



Phyllachora Graminis (Pers.) Fuck. 



Common on Muhlenbergia Mexicana, Elymus Canadensis, 

 Panicum scoparium Asprella hystrix. 

 P. Trifolii (Pers.) Fuck. 



Abundant, conditial stage on Trifolium pratense, September. 

 Ploivrightia morbosa (Schw.) Sacc. 



Abundant on Prunus domestica, P. Padus, and wild P. 

 Americana, P. Virginiana and Japan plum. 



GYMNOASACE.-E. 



Exoascus communis Sadebeck. 



Rare on Prunus Americana in 1895; abundant on Prunus 

 Cerasus and P. domestica. Nursery stock defoliated in 

 August. Not as severe on P. Americana. Also 

 occurred on P. Mahaleb and P. avium. 



HYPHOMYCETE.-E-MUCEDINE . K. 



MonUia frucftgena Pers. 



Abundant late in season on fruit of Prunus Americana. 



