THE FUNGI WHICH CAUSE PLANT DISEASE 635 



Spots orbicular, 2-6 mm., white above with a reddish border, 

 mostly entirely reddish below; pycnidia epiphyllous, erumpent, 

 conic-hemispheric, broadly perforate above, beset with straight, 

 spreading, grayish-black, septate bristles, 100-150 x 4 m; conidia 

 oblong-fusoid, 18-27 x 4 ju. 



Very common on cowpea leaves in circular spots, with dark 

 pycnidia in concentric circles on white background/'^ 



Dinemasporium L6viell4 (p. 534) 



Pycnidia cupuliform, superficial, black, with dark bristles; 

 conidia elongate or allantoid, with apical spines. 

 Some thirty species, chiefly saprophytes. 

 D. oryzae Miy. is on rice.^* 



Dothichiza Libert (p. 534) 



Pycnidia erumpent, roundish, somewhat disculate, irregularly 

 dehiscent; conidia elongate or cylindric. In part =Cenangium. 

 About eleven species, chiefly saprophytes. 

 D. populea S. & B. parasitizes poplar.^*" 



Discula Saccardo (p. 534) 



Pycnidia disciform-patellate, imperfectly differentiated from 

 the substratum; conidia ellipsoid, elongate or cylindric. 

 Some twenty-five or thirty species, chiefly saprophytes. 

 D. platani (Pk.) Sacc.=Gnomoma veneta. See p. 274. 



Sporonema Desmazieres (p. 534) 



Pycnidia subepidermal, erumpent, at first 

 closed, then opening radiately; conidia ovate 

 or cylindric. 



Some sixteen species, chiefly saprophytes. 



S. platani Baum on Platanus=Gnomonia Fio. 365.— Sporonema 



•^ oxycocci on cranberry 



veneta. See p. 274. leaf. After Shear. 



S. phacidioides Desm.=Pseudopeziza tri- 

 folii. See p. 148. 

 S. oxycocci Sh.*" 

 Pycnidia amphigenous, excipuliform, thickened at the base, 



