112 A PLANT-DISEASE SURVEY IN TEXAS. 



Plate XVI. Fig. 1. — Portion of a leaf of century plant {Agave americana L.) 

 affected with blight due to Stagonospora gigantea Heald and Wolf. Fig. 2. — 

 Portion of the margin of the same leaf slightly enlarged, showing the distri- 

 bution of numerous pycnidia. 



Plate XVII. Fig. 1. — Leaves of geranium {Pelargonium sp.) affected with bac- 

 terial blight. Fig. 2. — Leaf of Begonia sp. affected with bacterial blight. 



Plate XVIII. Fig. 1. — A leaf of wild morning-glory {Ipomoea sp.) from the 

 under surface, showing the abundant sori of the white-rust {Albugo 

 ipotnoeae-panduranae (S.) Swingle). Fig. 2. — A small branch of the moun- 

 tain cedar {Juniperus sabinoides Nees.), showing the gelatinous sori of 

 Gymnosporangium exiguum Kern. Fig. 3. — Leaf-curl of the trompillo 

 {Solanum elaeagni folium Cav.), due to the presence of nematodes {Tylen- 

 chus sp.). 



Plate XIX. Fig. 1. — Leaflet of the wild China tree {Sapindus drummondii Hook, 

 and Arn.) affected with CyUndrosporium griseum Heald and Wolf. Fig. 2. — 

 Buds of Yucca rupicola Scheele blighted by the attacks of Ccrcospora 

 floricola Heald and Wolf. Fig. 3. — Small portion of the inflorescence of 

 y. rupicola Scheele with flowers blighted by Cercospora floricola Heald 

 and Wolf. 

 226 



