344 THE FUNGI WHICH CAUSE PLANT DISEASE 



across, slightly elevated, light reddish-brown, becoming deep 

 chocolate-brown, subepidermal; teliospores prismatic, 12-15 by 

 30-45 fi; wall smooth, cinnamon-brown, uniformly thin, 1 ^i. 



and I on Larix, II and III on Populus. Common on all 

 species of Populus and often doing serious damage by its early 

 defoliation of the trees. 



M. bigelowii Thum. with O and I on Larix and II and III on 

 Salix is quite similar to the preceding. It occurs on practically 

 all species of willow. 



Other species not found in America are: 



M. allii-fragms Kleb.'" 



1 on Allium vineale and A. sativum. 

 II and III on Salix. 



M. allii-salicis albse Kleb.^^^ 



I on AUium. 



II and III on WUlow. 

 M. allii-populina Kleb.^^^ 



I on AlUiun. 



II and III on Populus. 

 M. klebahni Bub. 



I on Corydalis. 



II and III on Populus. 



M. larici-pentandrse Kleb.'" 



I on Larix. 



II and III on Salix. 



M. larici populina Kleb.^'^ 



I on Larix. 



II and III on Populus. 

 M. pinitorqua Host.*" 



I ( =CsBoma pinitorquimi). The Caeoma-stage is quite de- 

 structive to pine seedlings. The teliospores grow on Populus 

 leaves. 



M. repentis Plow. 



I ( =CaBoma orchidis); on Orchis. II and Illon Salix. 



M. ribesii-viminalis Kleb.'" 



I on Ribes. II and III on Salix. 



M. rostnipii Wagn.'" 



I on Mercurialis. II and III on Populus. 



