Jan. 1906] Cultures of Uredineae in 1905 *> 25 



of a heteroecoius rust, during my seven years of experimental 

 work, this is the first instance of success without the aid of some 

 probable clue, and in this case may be ascribed to good luck and 

 the exuberant enthusiasm of Mr. Kern, who made all the sow- 

 ings of the season. 



Teleutosporic material on Spartina cynosuroides, collected 

 at Palmer, Neb., by Rev. Bates, was sown May 26, on whatever 

 plants were available in the greenhouse, that are recorded as 

 bearing aecidia of unknown teleutosporic connection. These 

 hosts were : Polemonium rep tans, Poly gala Senega, Cassia Cha- 

 maecrista, Psoralea Onobrychis, Rudbeckia laciniata, Ambrosia 

 artemisiae folia, Thalictrum dioicum, Viola papilionacea, and Stei- 

 ronema ciliatum. To our great surprise 5*. ciliatum began to 

 show spermogonia June 1, and abundant aecidia June 6, all others 

 having no infection. Another sowing was at once made, June 2, 

 which likewise gave spermogonia June 7, and aecidia June 12. 



The aecidium on this host is recorded or known to the writer 

 from Iowa, Illinois, Nebraska, Kansas, Wyoming and Minnesota. 

 A collection made in Wisconsin 29 on 5*. lanceolatum is thought 

 by Burrill 30 to be specifically distinct. Schlechtendahl's name, 

 Caeoma Lysintachiae, sometimes used for American specimens, 

 was founded on an aecidium on L. thyrsiHora L. (Naumburgia 

 thyrsiflora (L.) Duby) from vicinity of Berlin, and doubtless is 

 entirely distinct from American forms, with the possible excep- 

 tion of the reference in Farlow & Seymour's Host Index, 31 the 

 basis for which is unknown to the writer. Schweinitz's name 82 

 "Aecidium Lysimachiae applies to the form on Lysimachia quad- 

 rifolia and L. terrestris, only reported from North Carolina, and 

 may well be considered distinct. What is now much needed is 

 teleutosporic material from the Atlantic and Gulf coasts to be 

 used in cultures for testing the above points, and in general the 

 question whether the eastern and western forms are one species 

 or not. 



The great prevalence of this rust on Spartina, and the com- 

 parative rarity of the aecidia on Steironema, is doubtless due in 

 part to the hardiness of the uredospores, which enable them to 

 live over winter and start the uredostage in the spring under 

 favorable conditions. This is the opinion expressed by Mr. 

 Bartholomew in a recent interview, and is my own opinion, 

 founded in part upon finding uredosori upon young blades of 

 Spartina only a few inches long at such an early date in spring 

 that infection by means of aecidiospores seemed highly improb- 

 able. 



"Trelease, Paras. Fung. Wis. p. 30. 



"Burrill, Paras. Fung. 111., I. Uredineae, p. 233. 



81 L. c. p.75. 1890. 



"Schrift. d. nat. Ges. Leipzig i:67. 1822. 



