THE FUNGI WHICH CAUSE PLANT DISEASE 491 



P. pomarum Thum. on pomaceous fruits in Europe. 



P. myzise Far. is associated with an apricot fruit spot. 



P. omnivora McA. is described as the cause of Australian wither 

 tip of the orange *" while to P. citricarpa McA is attributed another 

 common Australian citrous fruit disease. 



P. mororum Sacc. is on Morus. 



P. tuberculata McA. causes a disease of grape berries in Aus- 

 tralia.'*^ 



P. lophiostomoides Sacc. is common and perhaps parasitic on 

 cereals. 



P. hennebergii Kuhn produces brown spots on the glumes of 

 wheat and leads to some injury to the grain.^^ 



P. solanicola P. & D.*^ causes a disease of potato "' stems in 

 France. 



P. solani Hals.^* 



Pycnidia innate, depressed, oblong; conidia oblong. 



On egg plant causing damping-off of seedlings. 



P. subcircinata E. & E. 



Pycnidia black, 70-90 n; conidia 5-6 x 2-2.5 fi. 



Spots are produced on bean pods. 



P. sanguinolenta Rost.''^ 



Pycnidia scattered, subglobose; conidia ellipsoid, 4-6 x 1.5-3 

 n; surrounded by a slime which gives the spore-mass a violet-red 

 color. 



As the cause of a rot of carrot roots it has been reported in New 

 Jersey. 



P. oleracese Sacc.*^"^ 



Pycnidia scattered, globose depressed, papillate, sunken in 

 the tissues, J^-H mm.; conidia oblong, subcylindric, medially 

 constricted, apically obtuse, 5-6 x2 /x. 



Manns notes this fungus causing a serious cabbage disease in 

 Ohio. The pycnidia are sparse on oval simken diseased areas on 

 the stems, and bacterial invasion follows soon in leaves, cam- 

 bium and xylem. The cambium is rapidly destroyed and the 

 plant collapses. Bos *'' and Quanjer * have demonstrated the 

 pathogenicity of the fungus. 



P. napobrassicse Rost. causes rot of mangolds in Den- 

 mark; ^'"^^ also recently reported from Canada.^* 



