60 STATE HOBTICULTURAL SOCIETY 



719. P. thalictri, Chev. 



On ThaUctrum diocum, L. 



720. P. veronicae, (Shum.) Wint. 

 On Veronica virginica, L. 



721. P. vexans, Farlow. 



On Bouteloua racemosa, Lag.; Sporobolas cuspidatus, 

 Torr. 



722. P. violce, DC. 



On Viola cucullata, Ait. 



723. P. xanthii, Schw. 



On Xanthium canadense, Mill. 



724. P. zygadeni, Trelease. 



On Zygadenus elegans, Pursh. 



725. P. heucherce, (Schw.) 

 On Mitella diphylla, L. 



726. P. sorflf/w, Schw. 



Abundant August and September on corn. 



727. P. helianthi, Schw. 



Abundant on Helianthus tuberosus and JT. grosseseratus 

 July, August and September. In August especially 

 destructive to cultivated sunflower. 

 Phragmiodium, Link. 



728. P. gracile, (Farlow). 



On Rubus strigosus, Michx. 



729. P. obtusum, (Strauss) Wint. 

 On Potentilla canadensis, L. 



730. P. speciosum, (Fr.) 

 On Rosa blanda, Ait. 



731. P. subcorticium, (Schrank) Wint. 

 On Rosa blanda, Ait. 



732. P. rosae-alpina, Fr. 

 On roses, introduced. 



Gymnosporangium, Hedw. 



733. G. clavarlceformis, DC. 

 On Juniper. 



734. G. clavipes, C. & P. 

 On Red Cedar. 



