THE RUSTS OF NOVA SCOTIA. FRASER. 381 



On Arisaema triphyllum (L.) Schott., Pictou, Truro. 



This species is doubtless common. Collections made 

 throughout the summer show no uredinia and only a few 

 urediniospores mixed with the teliospores. 



Uromyces Limonii (DC.) Lev. 

 Nigredo Limonii (DC.) Arth. 



0. Pycnia amphigenous mostly hypophyllous, accompany- 

 ing the aecia, numerous, brown. 



1. Aecia amphigenous, in circular groups on brown or 

 reddish spots, peridium short, cylindrical, margin whitish, 

 lacerate. Aeciospores angular-globose or ellipsoid, 18-26 by 

 21-32/A, yellowish, finely verrucose. 



II. Uredinia amphigenous, scattered, mostly rounded 011 

 the leaves, oblong on the stem, long covered by the epidermis, 

 at length naked, pulverulent, cinnamon-coloured. Uredinio- 

 .spores globose, subglobose or ovate, 20-28 by 22-32/A, yellowish- 

 brown, densely verrucose, 2-3 pores. 



III. Telia amphigenous, scattered or in circular groups, 

 mostly rounded on the leaves, oblong 011 the stem, long 

 covered by the epidermis, at length naked, surrounded by the 

 ruptured epidermis, pulvinate, brownish-black or black. Telio- 

 spores subglobose, mostly clavate or oblong, sometimes angled 

 and irregular, 19-27 by 27-44/x, apex rounded or conical, base 

 narrowed ; wall brown, thickened at apex up to 8p, smooth ; 

 pedicel persistent, tinted, usually longer than spore. 



On Limonium carolinianum (Walt.) Britton, Pictou, Sep- 

 tember, 1909. 



The collections on this plant showed an abundant develop- 

 ment of aecia and telia, but no uredinia.. The first collection 

 of mature aecia was on June 10, 1910. 



TROC. & TRANS. N. S. INST. Sci. VOL. XTI. TRANS 26 



