Kern : Rusts on Cyperus and Eleocharis 



137 



II. Uredinia chiefly hypophyllous, scattered, oblong, 0.5-2 mm. 

 long, tardily dehiscent by longitudinal slits, ruptured epidermis 

 conspicuous, somewhat pulverulent, cinnamon-brown ; uredinio- 

 spores broadly ellipsoid or obovoid, 13-19 by 19-29 /x; the wall 

 yellowish or cinnamon-brown, 1-2 ix thick, moderately and finely 

 echinulate ; the pores 2, equatorial. 



III. Telia chiefly hypophyllous, scattered or more often con- 

 fluent in groups 1-3 mm. or more long, individual sori linear, o.i 

 mm. or less in width and surrounded by well developed brownish 

 stroma, blackish or grayish-black, long covered by the epidermis, 

 not or only slightly raised above the leaf surface ; teliospores 

 clavate-oblong, 15-21 by 39-64 /x, acuminate, obtuse or rounded 

 above, narrowed below, slightly or not constricted at septum ; the 

 wall dark cinnamon-brown, lighter toward base, about i /x thick, 

 much thicker above, 3-10 /x; pedicel short, tinted. 



On Cyperaceae : 



Cyperus cylindriciis (Ell.) Britton (C Torreyi Britton), 

 Delaware. 



Cyperus esculentus L., California, District of Columbia, 

 Florida, Indiana, Kansas, Michigan, Nebraska, New Jer- 

 sey, New Mexico, Oklahoma, Texas; Mexico (state), 

 Toluca. 



Cyperus fendlerianus Boeckl., New Mexico. 



Cyperus ferax L. C. Rich, Cuba ; Porto Rico. 



Cyperus giganteum Vahl, Porto Rico. 



Cyperus Hallii Britton, Missouri-. 



Cyperus Houghtonii Torrey, Nebraska, Wisconsin. 



Cyperus Mutisii (H.B.K.) Griseb., Jamaica. 



Cyperus reticulatus L., Porto Rico. 



Cy perils rotundus L., Florida, Kansas. 



Cyperus seslerioides H.B.K., Mexico (state). 



Cyperus speciosus Vahl, Kansas. 



Cyperus strigosus L., Alabama, Delaware, Illinois, Indiana, 

 Iowa, Kansas, Louisiana, Michigan, Mississippi, Nebraska, 

 New York, Oklahoma, Pennsylvania, Virginia, West Vir- 

 ginia. 



Cyperus surinamensis Rottb. (?), Texas; Cuba. 

 Cyperus thyrsiflorus Jung. (?), Mexico (state). 

 Cyperus sp., Colorado, North Carolina, Guatemala ; Oaxaca. 



