orton: north American species of allodus 189 



15. Allodus Ludwigiae (E. & E.) comb, nov, 



Aecidiiim Ludwigiae Ell. & Ev. Proc. Acad. Sci. Phil. 1893: 135. 



1893. 

 Puccinia Nesaeae Ell, & Ev. Bull. Torrey Club 22: 363. 1895. 



(Not Aecidium Nesaeae Ger. Bull. Torrey Club 4: 47. 1873.) 

 Dicaeoma Nesaeae Kuntze, Rev. Gen. 3^- 469. 1898. 

 Allodus Nesaeae Arth. Result. Sci. Congr. Bot. Vienne 345. 1906. 

 Puccinia Ludwigiae Holway, N. Am. Ured. 1: 72. 1907. (Not 



P. Ludwigiae Tepper, Bot. Centralb. 43: 6. 1890.) 



Aecia hypophyllous, in dense groups, often raised, rarely annu- 

 lar, on reddish spots, small, circular; aeciospores 13-19 by 15- 

 21 jx; wall 1-1.5 M thick, very minutely verrucose, appearing 

 smooth in water. 



Telia chiefly hypophyllous, inconspicuous, arising at first in 

 and later around the aecia, uncovered, compact, dark cinnamon- 

 brown; teliospores oblong to cylindrical or terete, 15-21 by 

 35~58m; wall cinnamon-brown, 1.5-2^1 thick, smooth, apex 

 7-12 fx thick, slightly paler; pedicel slightly tinted, sometimes as 

 long as the spore. 



On Onagraceae: 



Ludwigia alternifolia L., L. glandulosa Walt., L. hirtella 



Raf., L. polycarpa S. & P., L. sphaerocarpa Ell., L. virgataM.ic\iyi., 



and L. palustris Ell. 

 Type locality: Ellendale, Sussex County, Delaware, on Ludwigia 



sphaerocarpa {Commons, September i, 1892). 

 Distribution: Delaware to Iowa and to Florida and Louisiana. 



Note. — The telia are rarely collected ; here described on L. poly- 

 carpa from Iowa and Missouri. 



16. Allodus imperspicua (Syd.) comb. nov. 



Puccinia imperspicua Sydow, Monog. Ured. 1: 361. 1902. 



Aecia seen caulicolous only, gregarious, in oblong groups 1-5 

 mm. long; aeciospores 19-23 by 21-27 M! wall about i ju thick. 



Telia amphigenous, caulicolous, scattered or occasionally con- 

 fluent, roundish, early naked, pulvinate, chocolate-brown to 

 blackish; teliospores broadly ellipsoid, 24-34 by 34-51 m; wall 

 light chocolate-brown, 3-5 jx thick, the apex 7-10 ix thick, smooth; 

 pedicel colorless, up to 100 jx long. 



On Ammiaceae: 



Arracacia multifidaS. Wats. 



