38 



Arthur : Amphispores of grass and sedge rusts 



There is such a great difference between the two uredo forms 

 t some mycologists are not willing to accept the relationship 



here claimed. Absolute 



not be offered until cultures 



have been made. The species extends through central Mexico 

 and northward into the United States. 



3. Puccini A Stipae Arth. {Uredo Eriocomac Ellis, U. hixttri- 



ans E. & E., Puccinia siibsterilis E. 



P. micrantha Griff.) 



has uredospores of the usual appearance, globoid, with rather thin, 



rm 



The sori are yellow and inconspicuous. 





4 



Figure 3. Puccinia Stipae Ax\\x,', on Stipa^ Oryzopsis ^nA Ej'iocoma. Central 

 United States and Mexico. II, Uredospores. X, Amphispores. 



Figure 4, Puccinia tosta Arth.; on Sporobolus airoides^ etc. Central United 

 States. II, Uredospores. X, Amphispores, 



The amphispores have heretofore been considered the uredo- 

 form of a separate species, and have been called Uredo luxiirians 

 and Puccinia siibsterilis. They are about the same size as the 

 uredospores, more inclined to be ellipsoid, with a much thicker, 

 cinnamon-brown wall, strongly echinulate, and with pores similarly 

 arranged. The pedicels are persistent, and often very long. The 

 sori^ are dark brown, conspicuous, and have the appearance of 

 teleutosori. Amphispores have been found on Stipa viridida, S. 

 Vaseji 3ind Eriocoma ciispidata. The species ranges from Manitoba 

 to New Mexico and Arizona. 



4. Puccinia tosta Arth. {Uromyces scaber E. & E.) has 



