28 STATE HORTICULTURAL SOCIETY 



280. T. pruni, Ful. 

 Plum-pockets. 



PYRENOMYCETES. BLACK FUNGI. 



ERYSIPHE^E FAMILY. POWDERY MILDEWS. 



Sph^erotheca, Lev. 



281. 8. pruinosa, C. & P. 



On Rhus typhina, R. glabra and R. copallina. 



282. 8. pannosa, (Wallr.) Lev. 



On Rosa blanda, R. arkansana. Rose mildew. 



283. 8. malt, (Duby.) 



On upper parts of the twigs of apple, especially in 

 nurseries of young trees, and upon the suckers from 

 old ones. 



284. 8. mors-uvce, Schw. 



On Ribes cynosbati, R. gracile. This is the common 

 1 ' Gooseberry Mildew. ' ' 



285. 8. castnei, Lev. 

 On many plants. 



Erysiphe, (Hedw.) 



286. E. ciclioracearum, DC. 



Very abundant on Helianthus annuus, H. tuberosus. 

 Not so common on H. grosseserratus. Abundant on 

 Ambrosia artcmisiaifolia, A. trifida. 



287. E. lamprocarpa, Lev. 

 On mam^ compositce. 



288. E. tortilis, Fr. 



On leaves of Virgin 's Bower. 



289. E. communis, Fr. 



On leaves and stems of Anemones, also on grass leaves. 



290. E. martii, Lev. 



On cultivated peas. 



291. E. graminis, DC. 

 On grass. 



