Kern: Rusts on Cyperus and Eleocharis 



143 



On Cyperaceae: 



Eleocharis celliilosa Torrey, Porto Rico. 

 Eleocharis fiaccida (Spr.) Urb., Porto Rico. 

 Eleocharis geniculatus (L.) R. Br., Cuba; Guatemala; Porto 

 Rico. 



Eleocharis montana (H.B.K.) R. & S., California. 

 Eleocharis mittata (L.) R. & S., Porto Rico. 

 Eleocharis sp., Nicaragua. 



Type collected at Grenada, dept. Grenada, Nicaragua, on Eleo- 

 charis sp., Feb. II, 1903, C. F. Baker 2^8^. 



Distribution : The West Indies and Central America and in 

 southern California. 



The species here described differs from Piiccinia Elcocharidis 

 very markedly in urediniospore characters. The urediniospores 

 are smaller, somewhat thicker-walled and possess 2 equatorial 

 pores as compared with 3-5, usually 4, equatorial pores in P. 

 Elcocharidis. The distribution is tropical or sub-tropical whereas 

 P. Elcocharidis is chiefly a temperate region species. Judging 

 from the size of the urediniospores and the arrangement of the 

 pores Piiccinia liherta appears to be the correlated form of 

 Uromyces Elcocharidis. The type specimen is a part of a collec- 

 tion distributed by Baker as " Plants of Central America," and 

 although somewhat fragmentary bears both uredinal and telial 

 stages. There is a more ample specimen of the type collection at 

 the N. Y. Botanical Garden. 



7. Uredo incomposita sp. nov. 



O and L Pycnia and aecia unknown. 



IL Uredinia chiefly culmicolous, scattered or sometimes in 

 more or less evident groups, oval or oblong, 0.4-1.5 mm. or more 

 long, tardily dehiscent by longitudinal slits, somewhat bullate ; 

 urediniospores broadly elHpsoid or obovoid, often somewhat 

 angular, 18-26 by 27-37 /^; the wall golden- or cinnamon-brown, 

 moderately echinulate, 1.5-2 thick; the pores 2, equatorial, 

 in. Telia not known. 

 On Cyperaceae : 



Eleocharis geniculatus (L.) R. Br., Porto Rico. 

 Eleocharis intcrsiincta (Vahl) R. & S., Porto Rico. 

 Eleocharis sp., Guatemala. 



