353 



On Poaceae: 



Arena sativa L., Newark, July 17, 1903, C. O. Smith; Clayton, 

 July 24, 1907, (1708). 



This species is the common coronate spored rust and occurs through- 

 out the United States on cultivated oats and on a great variety of native 

 grasses. DeBary (Monat. Akad. Wiss. 211. 1866.) was the first to 

 conduct culture experiments indicating the genetic connection with aecia 

 on Frangula and Rhamnus in Europe. Since that time many European 

 authors have conducted culture experiments, a summary of which has 

 been made by Klebahn (Wirtw. Rostp. 254-262. 1904). 



In America this species has been studied by Carleton (Div. Veg. 

 Phys. & Path. 16:48. 1899), who obtained uredinia on cultivated oats, 

 Arrhenatherum elatius and Phalaris caroliniana by sowing aeciospores 

 from Rhamnus lanceolata. Carleton also carried out extensive cross 

 inoculations between oats and many native grasses. (See also Bur. PL 

 Ind. Bull. 63:15. 1904.) 



At about the same time Arthur (Bull. Lab. Nat. Hist. State Univ. 

 Iowa 4:398. 1898) obtained infection on oats with aeciospores from 

 R. lanceolata. In 1904 the same author (Jour. Myc. 11:58. 1905) suc- 

 cessfully confirmed the results of European and other investigators by 

 sowing aeciospores from Rhamnus cathartica, R. caroliniana, R. lanceo- 

 lata on Avena sativa resulting in the production of urediniospores in all 

 cases. In 1910 the same author (Mycol. 4:18. 1912) successfully in- 

 fected Rhamnus cathartica by sowing teliospores from Calamagrostis 

 canadensis from Nova Scotia. 



86. PucciNiA RUBELLA (Pers.) Arth. Bot. Gaz. 34:15. 1902. 

 Aecidium rubellum Pers. in Gmel. Syst. Nat. 2:1473. 1791. 

 Uredo Phragmites Schum. Enum. PI. Saell. 2:231. 1803. 

 Puccinia Phragmites Koern. Hedwigia 15:179. 1876. 

 On Poaceae: 



Phragmites Phragmites (L.) Karst., Wilmington, Nov. 1, 1893, 



A. Commons (2364). 



Winter (Hedwigia 14:115. 1875) was the first to show the relation 



between Puccinia Phragmites and Aecidium rnhellnm. He successfully 



infected Rumex hydrolapathum with sporidia from Phragmites. He also 



infected the latter host, using aeciospores. These results have been 



23—11994 



