THE FUNGI WHICH CAUSE PLANT DISEASE 643 



setae scattered or abundant, variously placed, straight or curved, 

 hyaline or subhyaline, septate, papillose, 60-90 x 4-6 /t. 

 It is the cause of a fig canker. 



Tuberculina Saccardo 

 Several species occur in sori of the Uredinales. 

 Ustilaginoidea Brefeld, a small genus of Ascomycetes, one species 



of which, U. virens, on rice is known only in the conidial stage. 



See p. 214. 



Sphacelia L6viell6 (p. 640) 



Sporodochia planose, effuse, stromate or sclerotioid; conidio- 

 phores short, simple, filiform; conidia apical, ovate. 

 A small genus, chiefly conidia of Claviceps and related genera. 

 S. segetum Lev. =Claviceps purpurea. See p. 212. 

 S. typhina (Pers.) Sacc. =Epichloe typhina. See p. 210. 



Dendrodochium Bonardin (p. 640) 



Sporodochium pulvinate or verruciform, white or light-colored; 

 conidiophores verticillate, branched; conidia acrogenous, ovoid to 

 oblong. 



A genus of about forty species. 



D. lycopersici March is found on tomatoes in Belgium.^"' 



Necator Massee (p. 640) 



Sporodochium erumpent, small, slightly convex, becoming 

 orange-red; conidia oblong or elliptic, catenulate, contents orange. 

 Monotypic. 



N. decretus Mas. is a dangerous parasite of coffee, tea, etc.^*'' '** 



niosporium Mattius (p. 641) 



Sporodochia wart-like, pulvinate or subeffuse, white or light- 

 colored, subgelatinous or waxy; conidiophores variable; conidia 

 globose, sigmoid, variable, embedded in mucous. There are some 

 forty species. 



I. malifoliorum Shel. 



Spots sulwrbicular or coalescing and becoming irregular, brown 



