348 



72. PucciNiA MINUTISSIMA Arth. Bull. Torrey Club 34:587. 1907. 

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



Nesaeae E. & E. 1895.) 

 On Lythraceae: I. 



Decoclon verticillata (L.) Ellis, Seaford, July 9, 1907, (2256) ; 

 Lewes, Aug. 14, 1907, (1690). 

 The Aecidium on Decodon was shown by Arthur in 1914 (Mycol. 

 7:86. 1915) to be the aecial stage of P. minntiHsima. Typical aecia 

 were developed on Decodon, following inoculation with telial material 

 on Curex filiformis from Ontario. The telial stage has not been found 

 in Delaware and has apparently been collected but rarely. Species 

 referred here in the Arthur herbarium occur on C. teretiuscula, C. fili- 

 formis and C. aquatilis. 



73. PrccixiA Nesaeae Ell. & Ev. Bull. Torrey Club 22:363. 1895. 



(Not Aecidium Nesaeae Ger. 1873.) 

 Aecidium Ludwigiae E. & E. Proc. Phil. Acad. 1893:155. 1893. 

 Puccinia Ludwigiae Holw. N. A. Ured. l':72. 1907. (Not P. Lud- 

 wigiae Tepper 1890.) 



Allodus Ludwigiae Orton, Mem. N. Y. Bot. Gard. 6:189. 1916. 

 Ox Onagraceae: I. 



Ludirigia sphaerocurpa Ell., Ellendale, Sept. 1, 1892, A. Com- 

 mons, (1983). 

 This collection is the type of Aecidium Ludwigiae E. & E. The 

 name here used for this species was applied by Ellis and Everhart to a 

 rust thought to be on Necium (Decodon). The host has been shown by 

 Holway (1. c.) to be Ludwigia poly car pa. The name has frequently 

 been misapplied to Aecidium Nesaeae Ger. on Necium which has been 

 shown by Arthur (Mycol. 7:86. 1915) to be the aecial stage of P. 

 minutissima (c. f. 67). 



The rust is evidently an opsis form. Telia have been rarely collected, 

 occurring in the Arthur herbarium only on L. jjolycarpa from Iowa and 

 on L. virguta from Florida. 



74. PuccixiA XOLITANGERIS Corda, Icones 4:16. 1840. 

 Puccinia argentata Wint. Rabh. Krypt. Fl. 1-:194. 1881. 



On Balsaminaceae: III. 



Impatiens biflora Wald., Newark, Sept. 7, 1905; Sept. 15, 1906; 

 Sept. 1907; (1552, 15.35, 2005). 



