337 



first proposed by Schweinitz was based on collections made at Salem, 

 North Carolina, occurring "erumpent from the dried stems of various 

 plants, e. g. Ambrosia, Chenopodium." In his later publication he cites 

 it as occurring in Pennsylvania on V. noveboracensis. An examination 

 of the material in the Schweinitz collection at the Philadelphia Academy 

 of Science, made by Dr. J. C. Arthur, shows that there are three packets, 

 containing in the aggregate 9 pieces, of similar stems bearing large sori 

 up to 3 cm. long. The original packet reads "P bullata LvS. Salem & 

 Beth, in caulibus varies." The stems all appear to be of Vernonia and 

 the rust when examined microscopically does not differ from similar 

 material on Vernonia stems (now interpreted as V. altissima) collected 

 by L. M. Underwood at Fern, Putnam Co., Indiana, and distributed in 

 Ellis & Ev. N. A. Fungi 2988 and other exsiccati under the name P. 

 Vernoniae Schw. No other rust with which this could possibly be con- 

 fused is known to occui' on the stems of Ambrosia or Chenopodium, or 

 on any other host within the range of this species. 



That the rust on the stems is the same as the more common, or at 

 least more frequently collected, form on the leaves has been shown by 

 Dr. Arthur who, in 1916, using telial material from the stems of Ver- 

 nonia sp. collected by C. H. Crabill at Cliffview, Va., and communicated 

 by Dr. F. D. Fromme, succeeded in obtaining the development of pycnia 

 and uredinia on the leaves of Vernonia sp. This culture also demon- 

 strates that this rust, whose life history has long been in doubt, is a 

 brachy-form referrable to the genus Bullaria. Pycnia have not been 

 observed in any field collections thus far studied. 



46. PucciNiA CANALICULATA ( Schw. ) Lagerh. Tromso Mus. Aarsh. 

 17:51. 1894. 

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

 Aecidium compositarum Xanihii Burr.; DeToni in Sacc. Syll. Fung. 

 7:799. 1888. 



On Carduaceae: I. 



Xanthium echinativm Murr., Seaford, June 4, 1908, (2049). 

 On Cyperaceae: II, III. 



Cyperus esculentus L., Selbyville, Oct. 4, 1907, (1794). 

 Cyperus filiculmis Vahl., Felton, Sept. 5, 1907, (1742). 

 Cyperus lancastriensis Porter, Selbyville, Oct. 4, 1907, (1813). 



22—11994 



