OP ARTS AND SCIENCES. 323 



A. B. Seymour, in June, 1883. This is probably the same as the 

 C Ahietis of Europe, although, as the spores were not quite ripe, one 

 cannot be certain. If tliere is a difference, it is to be found in the 

 fact that the teleutospores are arranged in threads which branch less 

 than in the European form. But at a later stage of development this 

 supposed difference might disappear. At the same time and place 

 Mr. Seymour found another interesting species of Uredinece also on 

 Abies Canadensis, not on the same branches as the species last men- 

 tioned, nor on the same trees, as far as can now be ascertained. 

 Spermogonia were abundant on both sides of the leaves, on whose 

 under surface were elliptic-al or elongated sori of a pale yellow color, 

 arranged in two rows parallel to the midrib. 



The spores were globose or somewhat elliptical, about 13-17/x in 

 length, and appeared to be borne in chains composed of a small num- 

 ber of spores. It is possible that this form is Ccenmn Ahietis-pecti- 

 natce Rees, of which I have seen no specimens. From the description 

 of Rees, however, his species has larger spores than ours, and no men- 

 tion is made of spermogonia. It may be well to des'gnate our form 

 under the name C(eoma Ahietis -Canadensis, until more exact infor- 

 mation can be obtained. Prof. J. Macoun has found the interesting 

 Melampsora sparsa Winter on Arctostajjhylos aJpina, on the island 

 of Anticosti. Visitors to the White Mountains should search for the 

 fungus there. 



