402 



THE RUSTS OF NOVA SCOTIA. FRASER. 



Teliospores of Pnccinia Asteris. 



On Aster macrophyllus L., Westville, Truro; A. acuminatus 

 Michx., Folleigh Lake; A. lateriflorus (L.) Britton, Pictou. 



The teliospores on Aster 

 acuminatus are slenderer 

 than on Aster macrophyll- 

 us. The groups of telia 

 are not so crowded nor so 

 abundant on the former. 



P. Asteris occurs on a 

 number of asters. Mor- 

 phological differences exist, 

 but they are not constant, so separation cannot be made on 

 these grounds. Cultures alone can show whether more than one 

 species are included. 



Puccinia Cicutae Lasch. 



0. Pycnia not observed. 



1. Aecia on the nerves of the leaves more frequently on 

 the petioles and stems, causing deformation, peridium poorly 

 developed, not cup-shaped, breaking through the epidermis and 

 rupturing irregularly. Aeciospores globose, sub-globose or 

 ellipsoid, 15-22 by 20-27>, subhyaline, finely punctate. 



II. Uredinia amphigenous, mostly hypophyllous, small, 

 scattered, circular, pulverulent, light brown. Urediniospores 

 .ovoid or ellipsoid, 20-24 by 20-30/ti; wall pale brown, echinulate, 

 pores 3. 



III. Telia similar to the uredinia but larger and darker. 

 Teliospores ellipsoid or oblong, 20-30 by 30-41/*, rounded at 

 both ends, slightly constricted at the septum; wall much 

 roughened, sometimes almost smooth, not thickened at the apex, 

 brown; pedicel hyaline, slender, deciduous, up to 30/*, some- 

 times placed laterally on basal cell. 



On Cicuia maculata L., Pictou, Piedmont. 



