236 The Plant World. 



coast f'f Alaska, by C. V. Piper, no. 4474. These are the onlv 

 Ainerican stations so far definitely known for the species. 



Puccinia Gentianae (Str.) Link, i. III on Gentiana frigida 

 Ilaenk. The specimen is especially interesting as it shows a 

 few veil developed aecia and an abundance of telia, while no 

 uredinios'^ores were to be found. The microscopic characters 

 agree with more southern collections in which urediniospores 

 are usually in the majority, but the aecia rare. 



Puccinia ? sp., II on Arctagrostis ariindinacea (Trin.) Beal. 

 This rust in its uredineal form is so much like Puccinia pyg- 

 maea Erikss., on Calamagrostis epigeii, occurring in Sw^eden and 

 Finland, that it would have been referred to this species but for 

 the following reasons: The uredinial sori of this species are 

 much larger and more conspicuous, being darker in color, than 

 those of the European form; they are also amphigenous, while 

 the European form is chiefly on one side of the leaf. The 

 urediniospores in the American form have somewhat thicker 

 walls, and somewhat more numerous and far more evident germ- 

 pores, than in the European form. The paraphyses are also 

 strongly capitate and much thickened above in this specimen, 

 while in the foreign ones they are chiefly clavate with a wall of 

 practically uniform thickness throughout. These dift'erences, 

 and the total absence of telia, make it unwise to list the collection 

 as Puccinia pygmaea, although it seems to be closely related, 

 possibly the same. It is the first collection of the kind from 

 America or elsewhere. 

 Purd^ie University, 



Lafayette, Indiana. 



CHANGE OF ASPECT WITH ALTITUDE. 



J. C. Blumer. 



The striking dissimilarity of the species growing upon two 

 slopes opposing one another in the general direction of a merid- 

 ian is well known, because easily observed. Much more elusive 

 is the fact that the same species changes its aspect, or slope- 

 exposure, from north to south in rising from its lower to its 



