146 IOWA ACADEMY OF SCIENCES. 



S. MTors-iivae (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). 

 Microspiicera Aim (D. C ) Wint. 



Abundant on Syringa vulgaris, S. Persica, Lonicera, August 

 and September. Abundant latter part of August and 

 September. 

 Erysiplie 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^. 



Physalospora Bidwellii (Ell.) Sacc. 

 None observed in 1895. 



DOTHIDEACE.E. 

 Phyllachora Graminis (Pers.) Fuck. 



Common on Muhlenbergia Mexicana, Elymus Canadensis, 

 Panicum scoparium Asprella hystrix. 

 P. TrifolU (Pers.) Fuck. 



Abundant, conditial stage on Trifolium pratense, September. 

 Plowriglitia morhosa (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. Narsery stock defoliated in 

 August. Not as severe on P. Americana. Also 

 occurred on P. Mahaleb and P. avium. 



HYPHOMYCETE.E-MUCEDINE.-E. 



Monilia fructigena Pers. 



Abundant late in season on fruit of Prunus Americana. 



