612 



THE FUNGI WHICH CAUSE PLANT DISEASE 



that exhibited in the Erysiphaceae, though morphologically they 

 may be inseparable. 



Fig. 411. — ^Helminthosporium gramineum. Conidio- 

 phoies and spores. After King. 



H. gramineum (Rab.) Erik, on grasses =Peleospora gramineum. 

 See p. 261. 

 H. trichostoma=Pleospora trichostoma. See p. 260. 



^ h/"""M 



Fio. 412. — Helminthospoiium teres. Conidiopboies 

 and spores. After King. 



H. teres Sacc. 



Spots oblong, olive, amphigenous; conidiophores fasciculate, 

 often crooked and nodulose, septate, brown, 100-130 x 12 ^; 



^' 



