342 



development of aecia following sowings of teliospores from A. virghiicus. 

 Uredinia were produced on Andropogon when aecia were used for in- 

 fection. 



Arthur in 1912 (Mycol. 7:71. 1915) using telia from Andropogon 

 sp. from North Dakota obtained the development of aecia on V. cucullata 

 and V. Nuttallii. 



In a later paper Long (.Jour. Agr. Res. 2:303-319. 1914) presents 

 the results of an extensive research dealing with this species and P. 

 Andropogonis Schw. in which he claims to prove "that the ordinary 

 Pentstemon rust P. Andropogonis, can be produced from the Viola rust 

 P. EUisiana, by simply passing the Viola rust through Pentstemon as 

 an aecial host." Numerous culture experiments were conducted in sup- 

 port of the above conclusion. 



58. PucciMA EMACULATA Schw. Trans. Am. Phil. Soc. II, 4:295. 1834. 



On Poaceae: 



Panicum capillare L., Newark, Sept. 15, 1905, (1615) ; Felton, 

 Sept. 5, 1907, (1750). 

 Successful cultures have never been conducted with this common 

 rust though many attempts have been made. Morphologically it is very 

 like P. Pammelii (Trel.) Arth. {P. Panici Diet.) and perhaps should be 

 united with it. On account of the resemblance to that species the aecia 

 should be looked for on Euphorbiaceous hosts. It is convenient, however, 

 to retain it as a separate form till cultures establishing its relationship 

 have been successfully carried out. 



59. PucciNiA EPIPHYLLA (L.) Wettst. in Verb. Zool.-Bot. Ges. Wien 



35:541. 1886. 

 Lycoperdon ejnphyllum L. Sp. PI. 1653. 1753. 

 Aecidiuvi Tussilaginis Pers. in Gmel. Syst. Nat. 2:1473. 1791. 

 Puccinia poarum Nielsen Bot. Tidsskr. Ill, 2:34. 1877. 

 On Poaceae: II. 



Poa annua L., Newark, June 1908, (2245). 



Poa pratensis L., Seaford, June 4, 1908, (2053a, 2042) ; Newark, 



June 1908, (2268). 



Nielsen was the first to show the relation between this rust and 



Aecidium Tussilaginis. He succeeded in infecting P. annua, P. trivialis, 



P. nemoralis, P. feriilis and P. pralensis by sowing aeciospores from 



