THE RUSTS OF NOVA SCOTIA. — FRASER. 



387 



III. Telia hvpophvllous, scattered, or somewhat grouped, 

 tsmall. Teliospores cylindrical, dark brown, 5-10 celled, 

 rounded above with a hvaline apiciilus 5-10/a, 26-31 by 

 75-127/u., verrucose; pedicel hyaline, tinted above, equal to or 

 longer than the spore. 



On Ruhus idaeus Yar. aculaetissimus (C. A. Mey) Regel 

 & Tiling, Oakfield, August 13, 1910. 



The description of the aeeia is based on that given by 

 Saccardo. 



Phragmidium imitans is a common species throughout 

 northern ^orth America. However, it does not seem tx> be 

 common in JSTova Scotia as onlv one collection was made. 



Phragmidium PotentilIae=canadensis Diet. 

 Kuehneola ohtusa (Strauss) Arth. 

 0. Pycnia epiphyllous in small crowded groups. 



IT. Uredinia hypophyllous, on reddish spots, orange-red, 

 roundish, scatt-ered or gregarious, pulverulent, surrounded by 

 clavate paraphyses. Urediniospores globose, elliptical or ovate, 

 13-18 by 16-22/Li, echinulate. 



III. Telia hypophyllous, small, orbicular, scattered, 

 brown, pulverulent, soon naked. Teliospores oblong, 21-24 by 



46-8 5/A, sometimes curved, mostly 

 3-4 septate, somewhat constricted 

 at the septum, usually obtuse at 

 the apex, (wall of lower cell often 

 hyaline), smooth; pedicel even, 

 colourless, usually about the 

 length of the spore. 



On Potentilla canadensis L., 

 Pictou, New Glasgow. 



A very common rust. The 

 uredinia and telia are usually 

 parasitized by Darluca filum. 



Teliospores of I'hraamidium 

 Fotentillae— canadensis. 



