THE RUSTS OF NOVA SCOTIA. FRASEK. 359 



broad by 19-25/* high, 2-4 celled; wall colourless, thin, 

 smooth. 



On Onoclea sensibilis L., Pictou, Truro, -Folleigh Lake. 



This species is abundant and usually shows a rich develop- 

 ment of the uredinial stage on its host. The aecia are not 

 common on my collections. Specimens of July 30 show 

 abundant uredinia but no teliospores. August and September 

 collections have well developed teliospores. 



Uredinopsis Struthiopteridis Stoerm. 



I. Aecia hypophyllous, scattered, roundish, bull ate, pale 

 yellow, peridium well developed. Aeciospores oblong or ovate, 

 somewhat angular, 16-20 by 24-35/*; wall colourless, thick, 

 especially at the angles, minutely verrucose; pedicels hyaline, 

 usually shorter than spore. 



II. Uredinia hypophyllous, scattered on yellowish or dis- 

 coloured areas, roundish, pale yellow, dehiscent by an apical 

 rupture; peridium delicate. Urediniospores mostly fusiform, 

 13-17 by 30-40/A, acute or accuminate, with a beak 3-8/* long; 

 wall colourless, thin, smooth, with two longitudinal serrated 

 ridges. 



III. Teliospores in the mesophyll, abundant, globose, 

 usually broader than, high, 20-2 7/* broad by 14-22/* high, 2-4 

 celled wall colourless or slightly yellowish, thin, smooth. 



On Onoclea 8truthiopteridis (L.) Hoffmn., New Glasgow, 

 Folleigh Lake. 



Collections at Folleigh Lake on August 31, show all the 

 stages well developed. The aeciospores in my collections are 

 distinctly though finely verrucose even when wet. 



Uredinopsis Atkinsonii Magn. 



I. Aecia hypophyllous, on pale spots, small ; peridium 

 strongly developed. Aeciospores oval or obovate, angular, 

 12-20 by 25-43/A, sometimes acute; wall colourless, rather thick, 

 closely and minutely rugose, appearing smooth when wet. 



