136 



Mycologia 



Host belonging to genus Eleocharis. 

 Teliospores 2-celled. 



Urediniospore-pores 2, equatorial. 



Urediniospores small, 13-21 X 18-27 ix. 



6. Piiccinia liherta. 

 Urediniospores large, 18-26 X 27-^7 /jl. 



7. Uredo incomposita. 

 Urediniospore-pores usually 4 (in occasional spores 3 or 5), equatorial. 



8. Puccinia Eleocharidis. 

 Teliospores i-celled. 9. Uromyces Eleocharidis. 



I. Puccinia canaliculata (Schw.) Lagerh. Tromso 

 Mus. Aarsh. 17: 51. 1894 



Sphaeria canaliculata Schw. Trans. Am. Phil. Soc. II. 4 : 209. 1832. 

 Aecidimn compositarum Xanthii ElHs, N. Am. Fungi ioi8b. 1883. 

 Aecidmm compositariim Arnhrosiae Burrill; DeToni, in Sacc. Syll. 



Fung. 7:798. 1888. 

 Aecidium compositarum Xanthii Burrill; DeToni, in Sacc. Syll. 



Fung. 7 : 799. 1888. 

 Puccinia cellulosa B. & C. ; Cooke, in Grevillea 20 : 108. 1892. 

 Uredo ustulata B. & C. ; Cooke, in Grevillea 20: no, hyponym. 



1892. 



Puccinia nigrovelata Ellis & Tracy ; Ellis & Ev. in Bull. Torrey 



Club 22 : 60. 1895. 

 Dicaeonia canaliculatum Kuntze, Rev. Gen. 3^ 466. 1898. 

 Dicaeoma nigrovelata Kuntze, Rev. Gen. 3^ : 469. 1898. 



0. Pycnia amphigenous, gregarious, in small compact groups, 

 honey-yellow becoming brownish, inconspicuous, globoid, 1 12-128/x 

 in diameter ; ostiolar filaments up to 35 or more long. 



1. Aecia chiefly hypophyllous, in orbicular or elongated groups 

 2-5 mm. or more across, on larger discolored spots or on swollen 

 areas on the stems, cupulate, low, 0.2-0.3 mm. in diameter; 

 peridium delicate, the margin finely eroded and slightly recurved ; 

 peridial cells rhomboidal, 23-29 /x, long, slightly overlapping, the 

 outer wall thick, 5-8 /x, striate, the inner wall thinner, 2-4 /a, 

 verrucose; aeciospores globoid, often angular, 13-16 by 15-19 /x; 

 the wall thin, i /x, or less, finely verrucose. 



On Ambrosiaceae : 



Ambrosia trifida L., Indiana, Missouri. 



Xanthium sp., Arkansas, Delaware, Indiana, Iowa, New 

 Mexico, Pennsylvania. 



