I 



Arthur : Amphispores of grass and sedge rusts 41 



ington and California, on Carex Doitglasii and C. testa. It closely 

 resembles the preceding species, and like it shows no summer 

 form of the uredospores, and only a few intermixed teleutospores. 

 The amphispores are similar to the last in color, surface markings 

 and pores, but they are a little larger and have the upper part of 

 the wall decidedly thicker than the sides. 



9. Puccinia (?) Garrettii n. sp. Two collections of this new 

 form, obtained at Salt Lake City, Utah, on Carex Hoodii Boott, 

 have recently been sent to me by A. O. Garrett : no. JJJ, Sept. 

 10, 1904, and no. 614, Oct. ir, 1904, the latter being taken as 

 the type. The sori resemble teleutosori, but contain only amphi- 

 spores. Not a single teleutospore could be found, and the species 

 is referred to the genus Puccinia on the ground that most Carex 

 rusts belong to it. Summer form of uredospores could not be 

 found. The amphisori are amphigenous, scattered, oblong, chest- 

 nut-brown, slightly pulverulent ; amphispores obovate or globoid, 

 21-26 by 27-35//, ^^^ 62.rk brown, rather thin, 1-1.5/i, evenly 

 echinulate, pores variable, 3-4, equatorial, pedicel colorless, semi- 

 persistent, one half to once length of spore. The species is notable 

 in possessing the thinnest-walled amphispores yet known. 



From the above descriptions and illustrations, which embrace 

 all examples so far known, it will readily be seen that amphispores 

 are the resting or \vinter form of uredospores. They are, how- 

 ever, no longer uredospores, accurately speaking, because they 

 show distinct structural differences, often very great, and are cor- 

 respondingly modified physiologically. They are clearly entitled 

 to recognition as a distinct sort of spore. 



Purdue University. 



