,SSO THE RUSTS OF NOVA SCOTIA. FRASER. 



IT. TJredinia amphigenous, mostly hypophyllous, rounded 

 or oval, pulverulent, surrounded by the ruptured epidermis. 

 Urediniospores ellipsoid or obovate, 10-20 by 21-27/*; wall 

 yellowish, very finely and densely echinulate, pores 2, lateral. 



111. Telia scattered, roundish on leaves, abundant and 

 elongated on the stem, pulvinate, blackish. Teliospores globose 

 or subglobose, 19-24 by 24-38/x. rounded or pointed above, wall 

 chestnut-brown, apex thickened up to 7/*,' smooth; pedicels 

 tinted, persistent, firm, long, usually much longer than the 

 spore. 



On I'olygonuni aviculare L., Pictou, Truro. 



This is a cosmopolitan species, and is probably common. 

 The collections were made in the fall, so no aecia were present. 

 The teliospores are not formed till late summer. 



Uromyces Arisaemae Oke. 

 Uromyces Caladii Farl. 

 Nigredo Caladii (Schw.) Arth. 



0. Pycnia hypbphyllous, scattered. 



1. Aecia hypophllous or petiolicolous, scattered, abundant, 

 low, margin erose. Aeciospores subglobose or ellipsoid, often 

 angular, 18-24 by 22-2 5/x, verrucose. 



II. Uredinia amphigenous, scattered, rounded or oblong, 

 often covered by the epidermis, frequently confluent. Uredinio- 

 spores pear-shaped, base truncate, 15-21 by 25-32/x, conspicu- 

 ously echinulate. 



III. Telia amphigenous, mostly epiphyllous. abundant, 

 scattered, rounded or oblong, long covered by the conspicuous 

 epidermis, sometimes confluent, somewhat pulverulent, brown. 

 Teliospores oval, subglobose or ovate, 19-27 by 27-40ju; wall 

 light yellowish -brown, uniform in thickness, with a small, 

 hyaline, apical papilla, (cometimes more than one), pedicel 

 hyaline, fragile, deciduous, about the length of the spore. 



