608 THE FUNGI WHICH CAUSE PLANT DISEASE 



S. graminis Fcl. 



Spots foliicolous, elongate, ochraceous; conidiophores densely 

 fasciculate, filiform, simple, sinuose, 90-100 x 

 6-8 n, subcontinuous; conidia fusoid-obclavate, 

 35-45 X 8-10 n, miiseptate, olive-brown. 



It is common, causing leaf spots on grasses, 

 especially on Avena and Phleum. It is de- 

 scribed on the latter by Trelease.''^ The my- 

 celitmi collects below the stomata and pushes 

 its tuft of hyphae through them. 



S. melophthorum P. & D. parasitizes melons 



and cucumbers in France; ^ 

 Fig. 409. — S. giami- o <- j_: -o • i. 



nis. After Sac- ». frazmi Pass. IS on ash. 

 <=^°- S. iridis F. & R. is on Iris; 



S. musse on banana. 



S. avense Erik, is on oats. 



Dematiacese-Phragmosporse (p. 594) 



Conidia 2 to many-celled, dark, rarely light or hyaline, ovoid to 

 cylindric or vermicular. 



Key to Genera of Dematiacese-Phraginosporte 



Fertile hyphae very short or little dififerent 

 from the conidia 

 Conidia not ia chains 

 Conidia muticate 

 Conidia united at base, fasciculate, 



cylindric 1. Cryptocor3^eum. 



Conidia separate 

 Conidia straight ovoid to cylindric 



Conidia solitary 2. Clasterosporium, p. 609. 



Conidia in bundles 3. Stigmina, p. 610. 



Conidia fusoid-falcate 4. Fusariella. 



Conidia cuspidate or setose 

 Hyphae dichotomous and broadened 



at apex 5. Urosporium. 



Hyphae not dichotomous or broad- 

 ened 6. Ceratophorum, p. 610. 



Conidia in chains 



