572 THE FUNGI WHICH CAUSE PLANT DISEASE 



Aspergilleae (p. 566) 

 Hyphae well developed; conidia in heads, catenulate. 



Key to Genera of Aspergillese 



Fertile hyphae inflated at apex 

 Fertile hyphae simple or nearly so 

 Sterigmata of apical vesicle none or 

 simple 



Conidia terminal on sterigmata 1. Aspergillus, p. 572. 



Conidia lateral and terminal on ster- 

 igmata 2. Dimargaiis. 



Sterigmata verticillately branched. ..." 3. Sterigmatocystis, p. 573. 

 Fertile hyphae dichotomous, branches 



curved. 4. Dispira. 



Fertile hyphae httle or not at all inflated 

 Fertile hjT)hae verticUlately branched at 

 tip 

 Tips equally verticillate; conidia doli- 



form 5. Amblyosporium. 



Tips imequally verticillate; conidia 

 globoid 

 Conidia without mucus 



Conidiophores slender 6. Penicillium, p. 573. 



Conidiophores swollen, conidia en- 

 closed in mucus 7. Gliodcladium, p. 574. 



Fertile hyphae not verticillate at tip 8. Briarea. 



Aspergillus (Micheli) Link 



Hyphae effused, creeping; conidiophores erect, simple, capitate; 

 conidia catenulate; sterigmata none or indistinguishable from the 

 conidia. 



The conidia are often found, the asci but rarely. 



A. fumigatus Brizi, is held responsible by Brizi^" for pathological 

 changes in wheat seed which rendered them incapable of germina- 

 tion. 



A. ficuum (Hen.) Weh. and A. phoenicis (Cda.) Lind. occur on 

 figs. 



