HYPHOMYCETES 



403 



Species of Alternaria, Macrosporium^ Cladosporium, etc., 

 are suspected of being phases in the life-cycle of Sphaeri- 

 aceous fungi. 



Stilbeae 

 The principal feature of this family consists in the 



FlG. 135. Helminthosporium turcicum, a fungus with 

 simple conidiophores growing in clusters. Each conidio- 

 phore bears a single, many-celled conidium at its tip. i, 

 portion of a leaf of maize showing a large dark blotch 

 formed by the fungus ; 2, conidiophores bearing conidia. 

 Fig. i, nat. size; fig. 2, mag. 



fasciculate arrangement of a number of hyphae, which 

 appear to be cemented together in a bundle to form a 



