94 A PL.\N'T-DISEASE SURVEY IN TEXAS. 



fades out into the green. The pycnidia are numerous, epiphyllous, 

 36 to 45 n in diameter; the spores are oval or elliptical, 4 to 6 by 

 2.5 to 3 jtx. 



Specimen collected: Seguin, 2310 (type specimen). 



Rust {Puccinia cognata Syd.).— Punctiform telia and uredinia are 

 produced upon the under surface of the leaves. Common. 



Specimens collected : Austin, 178, 346, 361. 



DAYTLGWER. 



Rust {Uromyces spegazzinii (DeT.) Kern. nov. comb.).— Observed 

 in only one locality, where it was very abundant on the dayflower 

 [Commelina virginica L.). 



Specimen collected: Austin, 232. 



DOCK. 



Dodder {Cuscuta indecom Choisy).— Observed on dock {Rum£x 

 herlandieri Meisn.) in a low, moist field, where it had grown over 

 other plants. 



Specimen collected: San Antonio, 1776. 



EA^ENING PRIMROSE. 



Powdery mildew {Erysiphe yolygoni DC.).— Found on the evening 

 primrose {Oenothera laciniata Hill) in only a single locality. 

 Specimen collected: Austin, 1051. 



EUPHORBIA. 



Rust {Uromyces euphorbiae Cke. and Pk.).— The rust is vei*y com- 

 mon on the euphorbias {Euphorbia spp.) of this section, forming on 

 the leaves very abundant brown, circular pustules. 



Specimens collected : San Antonio, 1397, 3174 ; Austin, 1420, 1908, 3102 ; Lock- 

 hart, 2077. 



FALSE DANDELION. 



Rust {Puccinia. pyrrhopappi Syd.).— The sori are produced pro- 

 fusely on the stems, leaves, and involucres of the false dandelion 

 {Sitilias midticardis (DC.) Greene). This rust was observed to be 

 exceed indv abundant in and about Austin, where it caused the death 

 of the plants. 



Specimens collected : Austin, 1073, 1264. 2948, 3061 ; Hempstead. 1515. 



^IRE^^^^ED. 



Leaf -spot {Cercospora vernoniae Ell. and Kellerm.).— This fungus 

 on the fireweed {Vemonia spp.) produces irregular, rounded, or angu- 



226 



