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156 



MISSOURI BOTANICAL GARDEN. 



EXPLANATION OF PLATES. 



Plate 35. — 1, A young plant of Agave Utahensis killed by Colleto- 

 trichum Agaves, 2, A plant partially killed, showing the fungus with 

 typical concentric lines of acervuli. 



Plate 3G. — 1, 2, Typical diseased areas with acervuli of C olletotrichum 

 Agaves. 



Plate 37. — 1, Acervulus of C olletotrichum Agaves bursting through the 

 epidermis of the host. 2, Conidia showing guttules. 3, Setae and 

 conidiophores bearing immature conidia. 4, Conidiophores with imma- 

 ture conidia. 





