213 



Polygonum aviculare 



Eryd-phe Polygoni 37 



Ovularia rigidula 345 



Vromyces Polygoni 174 



l*olygonum Convolvulus 



Erysiphc Polygoni 37 



Peronospora Polygoid 14 



Puccinia Polygoni-amphibii 149 



Polygonum oroctum 



Erysiphe Polygoni 37 



Polygonum hydropipcr 



Cercospora hydropiperiH 314 



Polygonum hydropiperoides 



Septoria Polygononnn 245 



Polygonum Muhlenbergii 



Cercospora hydropiperis 314 



Puccinia Polygoni-amphibii 149 



Septoria Polygonorum 245 



Polygonum pennsylvanicum 



Septoria Polygonorum 245 



Polygonum scandens 



Ustilago anomala 87 



Populus balsamifera 



Melampsora Medusae 108 



Populus deltoides 



Melampsora Medusae 108 



Populus grandidentata 



Melampsora Medusae 108 



Populus tremuloides 



Melampsora Medusae 108 



Populus sp. 



Melampsora Medusae. 108 



Portulaca oleracea 



Albugo Porlulacae 52 



Potentilla canadensis 



Phrngmidiinn triariiculalum 110 



I'otontilla monspclieiisis 



Mollisiu Dchnii 23 



Peronospora Poienlillue 15 



Ramularia arvensis 350 



Prenanthes alba 



Cercospora Prcnanlhis 320 



Prunella vulgaris 



Ramularia Brunellae 351 



Sphaerotheca humuli var fuliginea 47 



Prunus americana 



Cocconiyces Prunopliorae 30 



