270 THE FUNGI WHICH CAUSE PLANT' DISEASE 



3-4 fi, elliptic, guttulate; setae present, but almost obscured by 

 the spore mass. 



The ascigerous stage was demonstrated by Stoneman ^'" from 

 pure culture studies. The conidial stage was described by Hal- 

 sted ^" as the cause of a blighting of orchid leaves (Sobralia) in 

 New Jersey. 



Various hosts are orchids, Sarracenia, rubber plant, Dracaena --* 

 and Anthurium.^^^ 



Fig. 199. — G. rufomaculans, acerv'ulus showing conidia, 

 conidiophores and setae. After HasseLbring. 



G. rubicola (Ston.) S. & S. 



Perithecia quite similar to those of G. piperata and G. cinta 

 but lacking the apical tuft of hair and rather larger in size. 



Conidia (=Colletotrichum rubicolum) forming large, dark- 

 brown patches on the upper surface of the leaf; son small, dark, 

 suberumpent; conidia oblong, elliptic, 12.5 x6 fi. 



The conidial form on red raspberry was shown .by Stoneman ^■*'' 

 by pure culture studies to possess this ascigerous stage. 



G. psidii (Del.) Shel.2<'3-264 



Perithecia 200-300 fi, spherical, rarely distinctly beaked; asci 



