New species of Uredineae— IV 



Joseph Charles Arthur 



The following new species are from various parts of the United 

 States, Canada, Mexico and West Indies. They were found in 

 part among new collections sent for determination and in part 

 among herbarium material which has long been known under 

 other names. For the new material I am especially indebted to 

 Messrs. E. W. D. Holway, C. L. Shear, G. P. Clinton, LeRoy 

 Abrams and C. H. Demetrio. In the present descriptions I have 

 used instead of the terms spermogonium, aecidium, uredo and teleu- 

 tosorus, the new terms pycnium (ruzvoc), aecium (atxia), uredinium 



( 



by the 



writer * as more convenient and uniform. Their application is 

 sufficiently self-evident to make further explanation unnecessary. 



Uromyces Dolicholi sp. nov. 



II. Uredinia amphigenous, scattered, round, 0.2-0.5 mm. 

 across, soon naked, pale cinnamon-brown, pulverulent, ruptured 

 epidermis inconspicuous ; urediniospores globose, 18-21 }i in diam- 

 eter, wall cinnamon-brown, medium thick, 1.5-2/,*, minutely and 

 closely echinulate, pores 4, equatorial. 



III. Telia amphigenous, scattered, round, 0.2-0.5 mm. across, 

 soon naked, cinnamon-brown, pulverulent, ruptured epidermis 

 inconspicuous; teliospores oblong, or oblong-lanceolate, 10-15 

 by 26-32/*, narrowed toward both ends, wall pale golden-brown, 

 smooth, thin, I fj. or less f thicker at apex, 3-6 t u t with nearly 

 colorless umbo ; pedicels slender, half length of spore, nearly 

 colorless. 



On Dolicholus texanus (T. & G.) Vail {Rynchosia texana T. & 

 G.), San Angelo, Texas, October 19, 1904, C. L. Shear (host de- 

 termined by E. L. Greene). 



A strongly marked species. To the unaided eye there is little 

 difference between the uredinia and telia, both being produced in 

 abundance, but under the microscope the teliospores appear much 



* Arthur, J. C. Terminology of the spore-structures in the Uredinales. Bot. 

 Gaz. 39: 219-222. 1905. 



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