146 IOWA ACADEMY OP SCIENCES. 
S. Mors-uvae (Schw.) Berk & Curt. 
Abundant on Ribes Grossulariae, R. floridum, June, July; 
leaves, stem and fruit. 
Phyllactinia suffulta (Reb.), Sacc. 
Abundant on Praxinus Americana, August and September. 
Uncinula necator (Schw.) Burrill. 
Common on Vitis Labrusca, Concord, Worden and especi- 
ally Roger hybrids (Agawam). 
MicrospJicera Alni (D. C.) Wint. 
Abundant on Syringa vulgaris, S. Persica, Lonicera, August 
and September. Abundant latter part of August and 
September. 
Erijsiphe Ciclioracearum B. 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 Amphicarpsea 
monoica. 
SPH^RIACE^. 
Pliysalospora Bidwellii (Ell.) Sacc. 
None observed in 1895. 
DOTHIDEACE^. 
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. 
Ploiurightia morbosa (Schw.) Sacc. 
Abundant on Prunus domestica, P. Padus, and wild P. 
Americana, P. Virginiana and Japan plum. 
GYMNOASACE^. 
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^-M QCEDINE^. 
Monilia fructigena Pers. 
Abundant late in season on fruit of Prunus Americana. 
