12 X8l Mycologia 



16. Uromyces Eleocharidis Arth., on Eleocharis palustris 

 (L.) R. & S., collected by Dr. E. W. Olive, at Brookings, S. D., 

 was sown on Laciniaria spicata, L. scariosa, Eupatorium seroti- 

 num, Poly gala Senega, Hydrophyllum virginicum, Amorpha fruti- 

 cosa, Symphoricarpos racemosus, Lepargyraea canadensis, and 

 Dirca palustris, with no infection. In 1906 the same rust was 

 sown on five other species of hosts without results. 10 



17. Uromyces Spartinae Farl., on Spartina Michauxiana A. 

 S. Hitch, (usually listed as 5". cynosuroides), collected by Pro- 

 fessor W. P. Fraser, at Pictou, Nova Scotia, was sown on 

 Steironema ciliatum (on 2 different dates), Polemonium reptans, 

 Phlox divaricata, and Tissa canadensis, with no infection. 



Another collection from the same collector and place, but on 

 S. patens (Ait.) Muhl., was sown on Steironema ciliatum (2 

 dates), Polemonium reptans, and Lysimachia terrestris, with no 

 infection. 



It is evident from the present repeated inability to infect 

 Steironema with Spartina rust from the salt marshes of the sea 

 coast, supposedly the same species as in the interior, 11 that the 

 status of this rust, or group of rusts, is not yet fully known. 

 Either we are dealing with more species than heretofore recog- 

 nized, or there are biological races yet undetermined. 



18. Uromyces Peckianus Farl., on Distichlis spicata (L.) 

 Greene, collected by Professor W. P. Fraser, at Pictou, Nova 

 Scotia, was sown on Tissa canadensis (on 2 different dates), 

 Mimulus ringens, and Rudbeckia laciniata, with no infection. 



19. Uromyces graminicola Burr., on Panicum virgatum L., 

 collected by Mr. W. H. Long, at El Reno, Okla., was sown on 

 Dirca palustris, Apios tuberosa, and Boltonia asteroides, with no 

 infection. Another collection on the same host sent by Mr. E. 

 Bartholomew from Stockton, Kans., was sown on Apios tuberosa, 

 Petalostemon purpureas, Cassia chamaecrista, Aesculus glabra, 

 Apocynum cannabinum, and Laciniaria spicata, with no infection. 



The same rust has been sown on eleven other species of hosts 

 in previous years. 12 



10 See Jour. Myc. 13: 193' 1907- 



11 For a statement regarding Uromyces on Spartina see Mycol. 2: 221. 1910. 



12 See Jour. Myc. 12: 13. 1906; Mycol. 1: 232. 1909; 2: 220. 1910. 



