40 Arthur : Amphispores of grass and sedge rusts 



consequently amphispores, is afforded by the successful germina- 

 tion by Carleton * of spores that had lain in the herbarium a year. 

 The distinction between summer uredospores and the resting form 

 or amphispores in this species needs further study. The species 

 ranges from Montana to Arizona, and as far east as Tennessee. 



6. Uromvces Rottboelliae Arth. was described from very 

 limited material, and while characteristic teleutospores and amphi- 

 spores were present, no specially good examples of true uredospores 

 were seen. So far as could be judged the uredospores are thin- 

 walled, and pale, but otherwise like the amphispores. 





r < * ^ > 



tSi'^^] '^i 't^vA/ 



t * t ' ."• 





8 



Figure 7- Puccbna Caricis-striclae Diet.; on Carex siricta. New York. X, 

 Amphispores. 



Figures. Pucdnia airofusca (D. & T. ) Holw. ; on Carex Douglasii and C 

 uhta. Western coast of United States. X, Amphispores. 



Figure 9. Puccmia Ga7-retiii Axihr, on Carex Hoodii. Utah. X, Amphispores. 



The amphisori are prominent and have the gross appearance 

 of dark brown teleutosori. The spores are globoid, very thick- 

 walled, finely verrucose, with four equatorial pores. 



7. PucciNiA CariciS'STRictae Diet. {Uromyces Caricis Pk.) has 

 been collected but once. It was found near Albany, N. Y., in 

 October, 1876, and distributed in Thuemen's Mycotheca tiniver- 

 sails, no, 7^6y and has not been met with since. To the naked 

 eye the sori look like teleutosori. The spores have uniformly 

 thick, dark brown walls, finely verrucose, with two pores, opposite 

 and a little below the equator, and have colorless semipersistent 

 pedicels. It seems impossible to find even stray uredospores of 

 the summer form ox\ the material of this collection, A few teleu- 

 tospores occur, and on the evidence of these Dietel placed the 

 species in the genus Puccinta, 



^8. PucciNiA ATROFUSCA (D. & T.) Holw. {Uromyces atrofusciis 

 Dudl. & Thomps.) is a western species recently found in Wash- 



*Bull. Bureau PL Ind. 63 : 21. 



