356 THE RUSTS OF NOVA SCOTIA. ERASER. 



Pucciniastrum Agrimoniae (Schw.) Tranz. 

 & I. Pycnia and aecia unknown. 



II. Uredinia hypophyllous, thickly scattered over definite 

 or extended yellowish areas, bullate, round, small, orange- 

 yellow, dehiscent by a central pore; peridium rather delicate, 

 hemispherical, cells small, cuboid. Urediniospores broadly 

 obovate or globoid, 12-16 by 15-23/x; wall hyaline, rather thin, 

 finely echinulate ; contents orange-yellow, fading to pale yellow. 



III. Telia hpyophyllous, forming scattered, irregular 

 patches, indehiscent. Teliospores intercellular, beneath the 

 epidermal cells, oblong or somewhat cylindrical, 18-30 by 

 19-32/*; wall smooth, brownish-yellow; contents colourless. 



On Agrimonia gryposepala Wallr., New Glasgow, Truro. 



This species was collected only near New Glasgow, but 

 there was a rich development on the plants infected. The 

 telia can -be easily recognized when the leaves have been killed 

 by the frost as small dark brown patches on the under side of 

 the leaves. They are late of being formed and only in late 

 collections will telia be found. Search was made on the 

 neighbouring conifers in the spring for the aecial stage, but 

 without success. Nothing whatever is known of it, but as 

 Pucciniastrum pustulaium has aecia on Abies in Europe, this 

 species may have like aecial hosts. 



UREDINOPSIS Magn. 



Cycle of development not understood ; telia and two other 

 spore forms known, called aecia and uredinia. 



Aecia small, bullate, roundish, indehiscent, Peridium 

 depressed globoid, delicate. Aeciospores borne singly on pedi- 

 cels, obovate to globoid, angular or polyhedral ; wall colourless, 

 medium thick, minutely verrucose. 



Uredinia bullate, roundish, usually larger than aecia, 

 dehiscent by central rupture, spores ejected in a long white 

 filament; peridium delicate. ITrediniospores borne singly on 



