332 NATURAL HISTORY BULLETIN. 



59<?. On Leptochloa dubia Nees., ii. Ill, near Tula, Mex , Holway. 



Orig. Descr. " Puccinia Bartholomewii n. sp. Amphigena, sori nudi, 

 pulvinati, elliptici vel oblongi, ]A,-2 mm. longi, interdum confluentes. 

 Uredosporse globosse vel ovoidese, flavo-brunneae, dense et breviter 

 echinulatae, ca. 24// longae, 22(t latse. Sori teleutosporiferi fusco-atri; 

 teleutosporae utrinque rotundatse, medio vix constrictse, apice parum 

 incrassatse, leves, longe (usque 140") pedicellatae, obscure brunnese. 

 Longitudo sporarum 32-40//, latitudo 20-24/i. 



In foliis Boutelouse oligostachyce, Kansas (Amer. bor. ) Martio 4, 

 1892, legit E. Bartholomew (No. 522), comm. J. B. Ellis.'' 



SYX: 



1898. Dictcoma Bartholomewii Kuntze. Rev. Gen. PI. 



3:468. 



O. I. Spermogonia and ascidia unknown. 



II. Uredosori amphigenous, oblong, pale yellow, incom- 

 pletely uncovered, pulverulent, ruptured epidermis conspicu- 

 ous; uredospores ovoid or globose, 18-23 by 23-26/x, con- 

 tents orange-yellow when fresh, wall medium thick, colorless, 

 minutely tuberculate or sometimes barely echinulate, pores 

 obscure, 4 or more, scattered. 



III. Teleutosori amphigenous but especially hypophyllous, 

 pulvinate, early naked, blackish-brown, ruptured epidermis 

 usually noticeable; teleutospores broadly oblong, elliptical, 

 or nearly globose, dark brown, not constricted at the septum, 

 20-25 by 27-40/A, side-walls medium thick, apex rounded or 

 very obtuse, slightly thickened, base rounded, pedicel once to 

 twice the length of the spore, 4-8/x thick, delicate and often 

 collapsed, tinted. 



EXSIC: 



Ellis & Everhart, N. Am. Fungi, 2990, 3349. 

 Bartholomew, Ellis & Everhart's Fungi Columbiani, 1569. 

 Sydow, Uredineen, 1061. 

 Griffiths, West Amer. Fungi, 269. 



This species is common on different species of Bouteloiia, 

 especially on B. oligostachya, from Iowa, Nebraska, and 

 Kansas to Texas, but rare on Atheropogon. Its gross ap- 

 pearance is not materially different from that of Puc. vexans, 

 which occurs on the same hosts throughout the same region. 



