102 A PLANT-DISEASE SURVEY IN TEXAS. 



sp.) first forms diffuse brown spots, circular, indefinitely margined, 

 1 to 5 mm. in diameter, and frequently bordered by a zone of yellow. 



In severe infections the entire leaflet may turn yellow, with the 

 exception of the brown spots on which the fungus is located. 



The conidiophores are amphigenous, but more abundant on the 

 under surface, closely fasciculate, brown, continuous except in the 

 aggregated basal portion, and 24 to 30 by 3 to 4.5 /*; the spores are 

 45 to 150 by 3 to 5 ^, olivaceous, nearly cylindrical, 1 to 5 septate, 

 and when mature frequently guttulate. (PL V, fig. 2.) 



An examination of Bavenel's specimens of Gercospora occiden- 

 talis and also of Ellis's collections of this species shows that they 

 should have been referred to the genus Ramularia. Since there is 

 already a valid R. occidentalism the specific name can not be retained. 



Specimens collected : On Cassia occidentalis L. — Beeville. 1868 : Cuero, 2580 ; 

 Stockdale, 2611; Yoakum, 2750; Hallettsville. 2773. 



Rust (Ravenelia longiana Syd.). — The sori are formed on the 

 lower surface of the leaves. 



Specimen collected : On Cassia roemeriwna Scheele — Llano, 1751. 



SMILAX. 



Leaf -spot (Cercospora smilacina Sacc). — This is the most com- 

 mon leaf disease of the smilax (Smilax bona-nox L.). The foliage 

 becomes thickly spotted with subcircular, reddish areas, with brown 

 margins. 



Specimens collected : New Braunf els, 1702 ; Llano, 1748 ; Elgin, 1876 ; Uvalde, 

 1929: Bastrop, 2037; Lockhart, 2063; Cotulla, 2179; Luling, 2226; Seguin. 

 2305; Georgetown, 2398; Round Rock, 2416: Gonzales, 2704; Flatonia, 2743; 

 Yoakum, 2762; Hallettsyille, 2792. 



Leaf -spot (PhyUosticta smilacis Ell. and Ev.). — The diseased areas 

 are conspicuously reddish brown or brown, circular or subcircular, 

 and vary from 2 to 8 mm. in diameter. They have a very pronounced 

 dark-brown border. The black, immersed pyenidia, 150 fx in diame- 

 ter, are either scattered or peripheral and on both surfaces. Gen- 

 erally, however, they are on only one surface of a given spot. The 

 spores are nearly spherical or slightly elongated, clear, granular, 10 

 to 14 by 7 to 9 /x. The spores in our specimens are smaller than in 

 the type (15 to 20 by 7 to 9 /*) . 



Specimens collected: Austin, 360; Boerne. 1656; Round Rock, 2412. 2413; 

 Hallettsville, 2789. 



Rust (Puccinia smilacis S.). — The upper surface of the leaf is 

 densely spotted with yellowish or brown circular spots from 1 to 2 

 mm. in diameter. On the under surface small brown sori have 

 broken through the epidermis. 



Specimens collected : Austin, 23 : San Marco9, 2090. 

 226 



