THE FUNGI WHICH CAUSE PLANT DISEASE 507 



, This is f*and associated with rUst sori on malvaceous hosts."' '* 



A. polennhiii Br. & Cav. occurs on Polemonium. 



A. pioiperda Lin. is parasitic on fir leaves. 



A. aquilegise Roum. spots columbine leaves. 



A. beticola P. & D. is on beet leaves; 



A. orobi Sacc. on sainfoin; and A. oryzae Catt. on rice in Italy. 



A. lactucse Rost. is on lettuce; 



A. aesculi Bub. & Kab. on ^sculus in Europe; 



A. pallida Bub. & Kab. on Acer in Europe; 



A. prtini Bub. & Kab. on the cherry in Europe; 



A. populicola Bub. & Kab. on the Silver Poplar in Europe; 



A. dianthi Berk, on Diauthus and other pinks; 



A. violas Sacc. causing spots on violet leaves; 



A. digitalis FcL on digitalis; 



A. iridis Oud. on Iris. 



A. juglandis Bolt, causes spots on leaves of Juglans; ^ 



A. aspidistrae Mas. on Aspidistra. 



A. fragariae Sacc. 



Perithecia partly immersed, black, 100-125 /i; conidia fusiform 

 to cylindric, constricted, 14-27 x 4-5.5 fi. 



This was reported by Dudley ^^ as occurring in injurious form 

 near Rochester, N. Y., causing spots, at first red, later brown, 

 on strawberry leaves. 



A. primulae Wail.^® 



Epiphyllous; pycnidia on discolored spots, scattered, depressed 

 globose, 100-110 n, pale brown, papillate ostiolate; conidia cy- 

 lindric, obtuse, 5-6 x 2-2.5 ju. On Primula. 



A. chrysanthemi Stev.'* 



Pycnidia few, immersed, early erumpent, single or scattered, 

 hemispheric, amber-colored, 100-200 /*; ostiole central, small, 

 often raised by a neck, dark-bordered; conidia oblong, straight 

 or irregular, 3-6.2 x 10-20 /*, apically obtuse, septum often ob- 

 scure, sometimes more than one; not constricted till germination. 



It causes blighting of ray flowers of chrysanthemums. 



A. medicaginis Bres. 



Spots small, angular, pale, clustered; pycnidia sublenticular, 

 apiculate, pale, becoming black, 200 x 160 n, context parenchy- 

 matous; conidia oblong, obtuse, scarcely constricted, 10-12 x 4- 



