392 



1 IXGOUS DISEASES OF PLANTS 



Chrysomyxa Rhododendri Picea excelsa 

 (De C.) De Bary (Norway spruce) 



Rhododendron ferrugi- 



neum 

 R. hirsutum 



Opsiautouredo (Stages O, I, III) 



HOSTS 



Puccinia Tragopogi Pers Tragopogon spp. (salsify) 



Opsiheterouredo (Stages O, I, III) 



O, I 

 Pyrus Malus (apple) 



HOSTS 



III 



Gymnosporangium ma- 

 cropus Lk. 



Juniperus virginiana 



(red cedar) 

 Pyrus coronaria (wild J. virginiana (red cedar) 



crab) 



Gymnosporangium globo- Pyrus Malus (apple) 

 sum Farl. 



Pyrus communis 



(pear) 



Pyrus americana 

 Cydonia vulgaris 



(quince) 

 Gymnosporangium. Sabi- Pyrus communis 



nee (Dicks.) Wint. (pear) 



Gymnosporangium clava- Crataegus tomentosa 

 riceforme (Jacq.) Rees 



J. virginiana (red cedar) 

 J. virginiana (red cedar) 



J. virginiana (red cedar) 

 J. virginiana (red cedar) 



J. Sabina 



J. communis (common 

 Juniper) 



Brachyautouredo (Stages O, II, III) 



HOSTS 



runinia Hicnnii (Schum.) Mart. . Hieracium spp. 

 riiccinia snaveolens (Pers.) Rostr. . Cirsium arvense (Canada thistle) 



Hemiuredo ( Stages II, III) 



HOSTS 

 Umtnyccs < 'uryopliyllinns (Schrank; 



Wint Dianthus Caryophyllus (carnation), etc. 



Uromyces scutellatus (Schr.) Wint. Euphorbia spp. (spurges) 



