378 THE RUSTS OF NOVA SCOHA. FKASER. 



Aecia on Silphium integre folium Mich,, 8. teribinthin- 

 aceum Jacq., 8. perfoliatum L., S. laciniatum L. (Not col- 

 lector! in N. S.) 



Uredinia and telia on Juncus tennis Wild., Picton and 

 vicinity. 



The collections of this rust were so badly parasitized that 

 the description is largely based on Arthur's original descrip- 

 tion (Jour. Mycol. 13: 202. 

 1907). The aecial hosts are not 

 found in Nova Scotia. The rust 

 is common. 



The rust has generally passed 

 as Uromyces Junci (Desm.) Tul. 

 Arthur (1. c.) showed by cultures 



Teliosporesof Uromyce* Silpkii. that tne ' aecial Stage is OH 



Silphium and separated the rust. The European Uromyces 

 Junci has its aecia on Pulicaria dysinterica. A rust not 

 morphologically distinct is found in western North America 

 and has passed under the name of Uromyces Junci though no 

 cultures have been made to determine its aecial stage. 



Uromyces effusus Arth. 



Uromyces Junci-effusi Syd. 

 Nigredo Junci-effusi (Syd.) Arth. 

 & I. Pycnia and aecia unknown. 



II. Uredinia amphigenous, scattered, oblong or linear, 

 tardily naked, dark cinnamon-brown, ruptured epidermis 

 evident. Urediniospores broadly ellipsoid or oval, 14-19 by 

 18-26/K; wall light yellow, sparingly and bluntly echinul ate, 

 pores 4, equatorial. 



III. Telia amphigenous, numerous, scattered or collected 

 in groups about stem, oblong or linear, sometimes confluent, 

 ruptured epidermis conspicuous. Teliospores obovate or oval, 



