17,2 British Uredinea; and Ustilaginece. 



yEcidiospores on Raiinnculiis Jiairia, repciis, and bidbosiis, 

 March to May. 



Teleutospores on Poa irivialis, pratefisis, and annua, April 

 to July. 



Biology. — This species is said to occur on P. nemoralis as well 

 as on P. pratensis and irivialis, but I have been unable to produce it 

 on the first mentioned, although I have done so several times on the 

 two latter. In one serial culture in which the Uromyces from P. 

 irivialis was applied to R. ficaria, (2) rcpens, and (3) bulbosa, the 

 recidium was produced on the two latter, but not on the first named. 

 No result was obtained on R. auricomus and acris. At present it is 

 safer to say that Ur. poa; has its iscidiospores on R. ficaria, repens, 

 and apparently on R. bulbosus (because I do not like to be too con- 

 fident about one culture), and that it has its teleutospores on Poa 

 irivialis and pratensis. I have failed more than once in producing 

 the aecidium on R. ficaria from the Uromyces on P. irivialis, although 

 I have always succeeded with teleutospores from P. irivialis on A'. 

 repeiis, and I think it quite possible that there may be two species, the 

 one having its teleutospores on P. irivialis, and its scidiospores on 

 R. repens, the other with its teleutospores on P. praieusis, and its 

 Lccidiospores on R. ficaria. Further cultures can alone determine 

 the truth of this surmise. 



Uromyces junci. (Desm.) 



ALcidiospons — Pseudoperidia circinating, cup-shaped, with whitish 

 torn edges. Spores polygonal, irregular, globose or elongate, 

 pale orange, smooth, 15-23/x in diameter. 



Uredospores — Sori on brown or yellowish elongated spots, 

 scattered, irregular, rounded or elongated, confluent. Spores 

 rounded or elliptical, echinulate, pale brown, 17-28 x i5-i7/<. 



Teleniospores — Sori round or elongate. Spores dark brown, 

 usually elliptical or cuneiform, with much thickened and often 

 attenuated summits, deep brown, smooth, 20-40 x 15-20/x. 

 Pedicels long, thick, pale brown. 



Synonyms. 

 Uromyces Junci {\}i:-,m.). Winter in Rabh., " Krypt. Flor.," 

 vol. i. p. 162. 



Puccinia jmici, Desm. " Plant. Crypt. Edin.," 2nd edit., 



No. 170. 



Jiciditan zonale, Duby. " Bot. Gall.," vol. ii. p. 906. 



