THE FUNGI WHICH CAUSE PLANT DISEASE 257 



asci elongate-globoid; spores elongate, 2-celled, brown; paraphyses 

 present. Genus of one species. 



G. cerealis Pers. causes a serious grain disease in Europe, es- 

 pecially of wheat in Italy. ^*^ 



Dilophia Saccardo (p. 251) 



Perithecia sunken, not erumpent, delicate, dark-colored, ostiole 

 papillate; asci long-cylindric; spores elongate-fusiform to filiform, 

 multicellular, each end appendaged, the appendages hyaline, the 

 spores hyaline or yellow. Fig. 188. 



There are three species, one of which D. graminis (Fcl.) Sacc. 

 parasitizes rye and wheat in Europe. The conidial form Dilo- 

 phospora graminis Desm. is especially common. 



Metasphaeria Saccardo (p. 252) 



Perithecia clavate, sunken in a stroma, at first covered; leathery, 

 dark, with ostiole ; asci cylindric to clavate, 8-spored ; spores ellipsoid, 

 elongate, blunt or appendaged, 3 to many-celled ; paraphyses filiform. 



M. albescens Th<lm. is on rice in Japan. 



Leptosphaeria Cesati & de Notaris (p. 252) 



Perithecia at first subepidermal, at last more or less erumpent, 

 subglobose, coriaceo-membranous, globose, ostiole usually papil- 

 late; asci subcylindric; spores ovoid, oblong or fusoid, two or more 

 septate, olivaceous, yellowish or brown. 



There are about five hundred species, many of which in the 

 conidial forms embrace Cercospora, Phoma, Hendersonia, Sporides- 

 mium, Septoria, Coniothyrium or Cladosporium. 



L. coniothyrium (Fcl.) Sacc.^i*- '^^ 



Perithecia gregarious, subepidermal, depressed, globose, black; 

 ostiole papillate, erumpent; asci cyUndric, stipitate, 8-spored, 

 66-96 X 4-6 m; spores 1-rowed, oblong, S-septate, constricted, 

 fuscous, 10-15 X 3.5-4 n. 



Pycnidia (=Coniothyriimi fuckelii), similar to perithecia; spores 

 ovate, continuous, fuscous. 



It occurs on black and red raspberries and numerous other hosts. 



Stewart ''^ verified the assumed identity of the conidial form 

 with this ascigerous fungus by pure culture studies. 



