120 



Mycologia 



noted above on the cultivated hosts Calendula and Dimorphotheca. 

 It is suggested that P. Emiliae is probably correlated with some 

 species of subtropical cyperaceous Puccinia (several of which have 

 been described), the aecial connection for which is as yet unknown. 



The collections on Dimorphotheca and Calendula add another 

 rust to the increasing list of diseases of floricultural crops, which 

 may, under certain conditions, become of considerable economic 

 importance. Since these hosts are annuals, propagated by seed 

 only, it is not anticipated that the rust will prove as destructive as 

 those occurring on hosts propagated by cuttings. 



Uredo abdita sp. nov. 



II. Uredinia obscured by dense tomentum of host, apparently 

 amphigenous, round or oval, large, 0.5-1.5 mm. in diameter, early 

 naked, very pulverulent, chestnut-brown, ruptured epidermis not 

 conspicuous ; urediniospores usually considerably flattened laterally, 

 with pores in face view globoid or broadly ellipsoid, 26-29 by 

 26-32 jjl, with pores in optical section oblong or narrowly ellipsoid, 

 20-24 by 26-32 /x; wall chestnut-brown, thick, 2.5-3^, moderately 

 but very finely echinulate, appearing smooth when wet, the pores 2, 

 superequatorial. 



On Carduaceae [Senecioneae] : 



Senecio Cineraria DC. (cultivated), Catalina Island, Cali- 

 fornia, Aug. 1912, E. Bethel (type). 

 • This species differs in pore characters and markings of the 

 urediniospores from other Senecio rusts which we have been able 

 to obtain for examination. 



Purdue University, 



Lafayette, Indiana. 



