391 THE RUSTS OF NOVA SUOTIA. — FHASER. 



Life cycle Aviih all the spore-forms Dicaeqina. 



Life cycle with pyciiia, aecia and telia Allodus. 



Life cycle with pycnia, urcdinia and telia Bullaria. 



Life cycle with pycnia and telia Dasyspora. 



Puccinia Hieracii (Schuni.) Mart. 



0. Pycnia not observed. 



1. Aecia probably not formed. 



IT. L'rcdinia amphij^enous, mostly epiphyllous, scattered^, 

 punctiform, soon naked, pulverulent. Urediniospores globose^ 

 subglobose or ellipsoid, 16-24 by 22-27/'i; wall yellowish-brown, 

 echinulate, pores 2. 



III. Telia similar to the uredinia but elliptical to oblong; 

 on the stem and darker brown in colour. Teliospores ellipsoid 

 or ovate-ellipsoid, 18-22 by 22-3f)/Jt, rounded at both ends, not 

 or slightly constricted at th(> septum ; wall brown, equally 

 thickened, finely verrucose; pedicel delicate, hyaline, decidu- 

 ous, mostly short but sometimes exceeding the spore. 



On IJieracium scahrum Michx., Pictou; II. canadense 

 Michx., Macdonald's Barren, C. B. ('Collected by C. B. 

 Robinson). 



Formerly a number of species on Compositae w^hich show 

 little morphological differences were included under F. 



Ilieracii. Jacky by cultures showed 



(( j| r~^\ that infection from teliospores on 



((___j\ \~)j \( yj Ilieracium was confined to plants of 



r^ jj \:f this genus. This was also shown to 



hold lor some other genera of the 

 Compositae, that is teliospores from 

 Teliospores of ruccinia oue geuus of host plants could not 

 Hieracu. infoct a different genus. As a result 



tf Jacky's work the rusts on the different genera of the Com- 

 positae are regarded as distinct. 



