600 THE FUNGI WHICH CAUSE PLANT DISEASE 



Monotosporese (p. 595) 

 Conidia dark, solitary, acrogenous. 



Key to Genera of Monotosporese 



Sterile hyphae lacking 



Fertile hyphae short and fascicled at 



base 1. Hadrotrichum. 



Fertile hyphse longer, separate 2. Monotospora. 



Sterile hyphse present 

 Conidia with a loose hyaline membrane . 3. Nigrospora. 

 Conidia without a membrane 

 Conidia with a large shining drop. . . 4. Sporoglena. 

 Conidia without a shining drop 5. Acremoniella, p. 600. 



Acremoniella Saccardo 



Hyphse creeping, simple or ramose, hyaline or colored; conidio- 

 phores simple, short, subbulbous below; 

 US f% conidia globose to ovoid, fuscous. 

 About a dozen species. 

 A. occulta Cav.^ forms brownish-yellow 

 flakes on the stems of cereals; 

 A. verrucosa Togn. on wheat in 

 A "^^lA/^^^:^ Italy. 



Fio. 402.— AcremonieUa. HaplographieSB (p. 595) 



After Bonorden. 



Conidia dark, catenulate. 



Key to Genesa of Haplographies. 



Sterile hyphse aU creeping or obsolete 

 Fertile hyphse simple, not branched at tip 



Chains of conidia lateral 1, Dematium. 



Chains terminal 



Conidia without isthmi 2. Catenularia. 



Conidia connected by cylindric 



isthmi 3. Prophytroma. 



Fertile hyphse branched 

 Hyphaj dendroid 4. Hormodendrum, p. 601. 



