THE RUSTS OF NOVA SCOTIA. FRASER 415 



slightly constricted at the septum; wall yellowish-brown or 

 brown , thickened at the apex, smooth; pedicel short, thickened, 

 coloured, persistent. 



Pycnia and aecia on Rhamnus 

 cathartica L., Pictou. 



Uredinia and telia on Avena sativa 

 L., Pictou, Truro. 



This rust is very common on the 

 cultivated oat. It is found chiefly on 

 the leaves. It is much more common 

 in this vicinity than Puccinia graminis. 



Teliospores of Puccinia Lolii. , 



Both are often found occurring on the 



same plant, P. Lolii on the leaves, and P. graminis chiefly on 

 the stems and sheaths. 



Culture experiments have shown the following form species : 



1. Avenae en Avena sativa. 



2. Alopecuri on Alopecurus pratensis. 



3. FestucaQ on Festuca elatior. 



4. Lolii on Lolium perenne. ' ! ' -\ 



5. Glyc&riae on Glyceria aquatica. 



6. Hold 011 Helens lanatus and H. moths. 



Puccinia coronata Cda. 

 Puccinia Rhamni (Pers.) Wettst. 



& I. Pycnia and aecia on Rhamnus alnifolia. (Not 

 collected). 



II. Uredinia hypophyllous, scattered or arranged in lines, 

 sometimes confluent, small, more or less oblong, pulverulent, 

 orange. Urediniospores globose, sub-globose or ovate, 16-24 by 

 20-30jn, echinulate, yellow, pores 3 or 4, paraphyses present. 



III. Telia hypophyllous or caulicolous, scattered, some- 

 times in long lines on the stem, sometimes confluent, oblong or 

 linear, covered for a long time by the epidermis, at length 



