THE UREDINALES FOUND UPON THE ONAGRACEAE 535 
Niobrara river valley in Nebraska, is distinctive, possessing cylindrical 
aecia and large, thick walled aeciospores. The telial stage perhaps 
occurs upon some Monocotyledonous host; quite possibly upon a 
sedge or a grass. One possibility, judging by the codistribution of 
host and rust, appeared to be Puccinia eminens Kern on Car ex Backii 
Boot. An unreported culture in this laboratory, was, however, un- 
successful, and no definite morphological characters of the two species 
serve to indicate a relation. 
2. Aecidium Circaeae Cesati & Mont., in Montague, Syll. Gen. 
Spec. Crypt.: 312. 1856. 
Synonymy: Caeoma epilobiatum Link, in Willd., Sp. PI. 6^: 59. 1825. (In part) 
Aecidium Circaeae Cesati in Rabenh. Herb. Mycol. No. 372. 1861. 
Literature: Winter, in Rabenh. Krypt. Fl. i: 266. 1881. Saccardo, Syll. 
Fung. 7: 791. 1888. Schroeter, Pilze Schles. i: 379. 1889. Klebahn, Krypt. 
Mark Brand 5'': 870. 1914. 
This form, known only from Europe, on Circaea, has not yet been 
connected with a telial stage. Klebahn points to the fact that 
Brachypodium silvaticum Roem. & Schult. often grows in association, 
but he was unable to prove a connection with the rust Puccinia Baryi 
(Berk. & Br.) Winter. A comparison of these two forms fails to give 
a clue to a relationship between them. 
The name Caeoma epilobiatum Link is used by Saccardo and by 
Klebahn as in part a synonym. This name is discussed further in 
this paper under Puccinia Epilohii-tetragoni. 
3. PucciNiASTRUM PUSTULATUM (Pers.) Dietel, in Engler & Prantl, 
Pflanzenfam. 1^++: 47. 1897. 
Description: N. Amer. Fl. 7: 107. 1907. 
Literature: Saccardo, Syll. Fung. 7: 762. 1888. Schroeter, Pilze Schles. i: 
364. 1889. Klebahn, Krypt. Mark Brand, s"*: 831. 1914. Sydow, Monogr. 
Ured. 3:444. 1915. 
Pucciniastrum Abieti-chamaenerii Kleb. is united, in the North 
American Flora, with Pucciniastrum pustulatum. There are but 
slight differences in the morphological characters of the two species. 
Cultures, made in America since the publication of the description in 
the Flora, and substantiating European cultures, have been successful, 
however, only with the Pucciniastrum Abieti-chamaenerii form. It 
would seem, therefore, that the two forms might well now be con- 
sidered as separate races. 
