THE RUSTS OF NOVA SCOTIA. FRASER. 



This species was found only at 

 Cole's Pond, near Pictou. A few of 

 the teliospores were germinating 

 when collected. It was rather 

 abundantly developed in a limited 

 area. 



Clinton (Report Conn. Agric. 

 Exper. Sta. Pt. 6:380. 1907) 

 sowed the spores of Peridermium 

 pyriforme Peck on Myrica asplen- 

 ifolia and the uredinia of this rust 



Tefial column of Cronartium basid- , TT , . , . , ,, 



ium with basidiospore* appeared. He thinks it probable 



that this species is identical with the European Cronartium 

 asclepiadeum Er. 



Family 4. PUCCINIACKAK. 



Basidia external, i. e. germinating by a typical pro- 

 mycelium. Telia usually erumpent, firm or pulverulent. 

 Teliospores fasicled or free, pedicelled ; wall firm or with outer 

 gelatinous layer, overlaid by the cuticle. 



The great majority of rusts belong to this family. The 

 teliospores may be one-celled as in Uromyces or two-celled as 

 in Puccinia or several celled as in Phragmidium. 



UHOMYCKS Link. 



Nigredo Roussel. 



Pycnia immersed in the tissue of the host, globose or sub- 

 globose with projecting neck. Aecia with evident peridium. 

 nrially cup-shaped. Aeciospores without distinct germ-pores. 

 TJrediniospores formed singly on distinct pedicels with several 

 germ-pores, echinulate or verrucose. Teliospores unicellular, 

 formed singly on distinct pedicels with a single apical gerrn- 

 pore. Basidiospores inequilateral, nearly reniform. 



