220 



Mycologia 



sibility that we may be dealing with a species having dimorphic 

 urediniospores is tentatively accepted. Whether this will alter 

 the present view of the taxonomic value of pore characters or 

 whether we are in error in uniting these two forms can be re- 

 vealed only by further investigation. For further discussion of 

 the pore problem the reader is referred to Mycologia 7 : 28-33 

 (I9I5)- 



9. Puccinia eminens sp. nov. 

 O & I. Pycnia and aecia unknown. 



II. Urediniospores broadly ellipsoid or obovoid, 15-21 X 23- 

 32 fx; wall cinnamon-brown, about 1.5 a* thick, evenly and rather 

 sparsely echinulate, the pores 3, equatorial. 



III. Telia roundish or oval, 0.4-1 mm. long, early naked, 

 chocolate-brown, teliospores broadly clavate, 1 3-24 X 45-67 ; 

 slightly constricted at the septum, rounded or more often nar- 

 rowed above, narrowed below ; wall chestnut-brown, 1.5-2 ^ thick, 

 much thicker above, 7-16/*; pedicel colorless, length of spore or 

 less. 



On Car ex saximontana Mack. (C. durifolia subcostrata Bates). 



Type collected in Colorado, May 22, 1909. E. Bethel; also 

 collected at Fort Collins, Colorado, May 24, 1896, C. F. Baker. 



One of the most characteristic features about this species is 

 the broad prominent telial sorus. The urediniospores agree with 

 Puc. urticata in pore arrangement but differ in being smaller and 

 darker colored. Acting upon a suggestion made by Mr. E. Bethel 

 an attempt has been made to infect this host, Carex saximontana, 

 with aecia from Ribes longiflorum but without success (Myco- 

 logia 8: 130, 1916). Specimens may have been distributed as on 

 Carex Backii or C. durifolia but the Rocky Mountain plant pass- 

 ing under those names is C. saximontana Mack. 



10. Puccinia microsora Korn; Fuckel, Fungi Rhenani 2637. 



1874 



Dicaeoma microsorum Kuntze, Rev. Gen. 3 3 :469. 1898. 

 O & I. Pycnia and aecia unknown. 



II. Uredinia of the typical sort oval or oblong, 0.5-1.5 mm. 

 long, bullate, long covered by the epidermis; urediniospores of 

 the typical sort ellipsoid, 20-26 X 26-30 ^ ; wall pale yellow or 

 nearly colorless, 1— 1.5/* thick, strongly and sharply echinulate, 



