THE FUNGI WHICH CAUSE PLANT DISEASE 207 



G. cerealis Pass., the cause of a serious wheat disease in Italy "^ 

 may be identical with the last species. 

 G. moricola Ces. & d. Not. grows on Moras. 



Pleonectria Saccardo (p. 198) 



Perithecia cespitose or separate, globose, pale, papillate; asci 

 8-spored; spores many-septate, muriform, hyaline. 



P. berolinensis Sacc, which occurs on various species of 

 wild and cultivated currants both in Europe and America has 

 been reported by Durand ^^^ as associated with a currant trouble 

 in New York. 



P. coffeicola Zimm. attacks coffee. 



Ophionectria Saccardo (p. 198) 



Stroma globose, tubercular, depressed or none; perithecia su- 

 perficial, clustered or scattered; asci cylindric to clavate, 2 to 

 8-spored; spores 4 to many-celled, fusoid to subfiliform, hyaline 

 or subhyaline. 



About fourteen species. O. coccicola E. & V. attacks scale in- 

 sects and is said also to cause gummosis of oranges. ^^' O. foliicola 

 Zimm. is foimd on coffee. 



Sphserostilbe Tulasne (p. 198) 



Stroma a slender stalk with a globose or conical head; perithecia 

 bright colored, membranous, globose, subglobose or ovate; asci 

 cylindric or subcyUndric, 8-spored; spores 2-celled, elliptic or 

 subelliptic, hyaline. Conidial phase Stilbum, Atractium or Micro- 

 cera. 



Some twenty species. S. repens 6. & Br. in India causes a 

 root disease of Hevea^^' and arrowroot. 



S. flavida Mass." causes disease of coffee in tropical America. 



Polystigma De CandoUe (p. 198) 



Stroma fleshy, effused, red or reddish-brown, growing on leaves; 

 perithecia sunken, only the ostiole being above the surface, thin, 

 leathery, hyaline; asci elongate, clavate, 8-spored; spores ellipsoid, 

 1-celled, hyaline. Three species. 



