24 c Canadian Arctic Expedition, 1913-18 



INDEX OF HOST PLANTS— Concluded 



Polemonium caeruleum 



Leptostroma herbarum 

 Potentilla palustris 



Mycosphaerella pachyasca 

 Potentilla pulchella 



Pleospora herbarum 

 Ranunculus affirms 



Mycosphaerella ootheca 



Pleospora vulgaris 



Rhabdospora sp. 

 Ranunculus nivalis 



Discosia acuta 

 Salix anglorum 



Melampsora Bigelowii 

 Salix ovalifolia var. camdensis 



Melampsora Bigelowii 

 Salix pulchra 



Hormiscium stilbosporum 



Leptosphaeria borealis 



Leptothyrium pulchrum 



Melampsora Bigelowii 

 Salix reticulata 



Mycosphaerella minor var. reticulata 



(Venturia subcutanea) 

 Salix Richardsonii 



Gnomonia sp. 



Propolis angulosa 



Scleroderris fuliginosa 

 Salix rotundifolia 



Rhytisma sp. 

 Salix sp. 



Cladosporium herbarum? 



Leptosphaeria borealis 



Mastomyces proboscidea 



Scleroderris fuliginosa 



Teichospora sp. 

 Saussurea angustifolia 



Pleospora vulgaris 

 Saxifraga Hirculus 



Dothidella sphaerelloides 

 Saxifraga Nelsoniana 



Mycosphaerella minor f. 

 Statice Armeria f. sibirica 



Clathrospora platyspora 

 Trisetum spicatum 



Mycosphaerella Tassiana. 



