104 A PLANT-DISEASE SURVEY EN TEXAS. 



Bust \Piiccirda gcmolobi Kav. and B.). — The sori are present on 

 both stems and leaves. On the stems they are so numerous as to form 

 a black crust. On the leaves they are scattered and on the lower 

 surface. 



Specimens collected: Austin. 334, 335. 1449. 



VTRGIx's-BOWER. 



leaf -blight (PMeospora adust a Heald and TVolf. 32). — This trouble 

 on the virgin's-bower (Clematis dntmmondu T. and G.) is very gen- 

 eral and very severe. The foliage has large, irregular, brown areas, 

 generally beginning on the leaf tips. The entire leaves become dry 

 and brown and more or less curled in the advanced stages of the 

 disease. 



The pycnidia are hypophyllous. 30 to 45 p in diameter and sparse. 

 T::e spores are cylindrical, hyaline. IS to 36 by 3 to 3.5 p, and one 

 to three septate. I PI. V. rig. 10.) 



Specimens collected: New Braunfels, 1699; Austin. 1726 (type specimen); 

 Llano, 1734: Beeville, 1833; Sabinal. 1976: Hondo. 199S: Bastrop, 2021: Seguin, 

 2303 : Georgetown. 2390 ; Gonzales. 2654 ; Kennedy, 2825. 



Rust {Puccini a tomipara Trel.). — Groups of yellowish- white cluster 

 cups appear on the foliage in the spring and late fall. The telia and 

 uredinia are reported as occurring on Bromus spp.. but no collections 

 have been made in our territory. 



Specimens collected: Austin, 309. 43S, 1424. 



WATER CRESS. 



Leaf -blight | Cercospora nasturtU Pass. >. — The leaves of water cress 

 [Radicula . ;_ ...rtium-aquaticura- (L.) Britten and Eendle) infested 

 with this fungus show circular to subcircular straw-colored or dirty- 

 yellow spots varying in size from 1 to 5 mm. There is generally more 

 or less concentric zonation. The diseased plants are stunted and show 

 a purple coloration of the foliage. 



The conidiophores are continuous. 45 to 60 by 3.5 p, and clear- 

 tipped. The conidia are 65 to 115 by 3.5 p, several septate, hyaline. 

 and granular. (PI. II. %. 1.) 



Specimen collected: Austin. 1448. 



WATER WILLOW. 



leaf-spot Oercospora diantherae Ell. and Kellerm."). — The affected 



leaves of water willow {Diantkera americana L.) show numerous 

 gray or brown spots. 1 to 4 mm. in diameter, surrounded by a darker 

 border. Extended areas of the leaf tissue may be killed and the 



226 



