'^ ^4 British UredinccE and UstilacrinecE. 



O' 



v> 



Synonyms. 



Winter, loc. cit., p. 233. 



Tremella clavaricE.foi-mis. Jacq., " Collect," vol ii. p. 174. 



Fodisonia juniperi, Fries. Berk., " Eng. Flor.," vol. v. p. 362. 

 Bull., t. 427, fig. I. Cooke, "Hdbk.," p. 510; "Micro. Fungi," 

 4th edit., p. 214. Johnst, "Flor. Berw.," vol. ii. p. 146. Grev., 

 " Flor. Edin.," p. 427. 



yEcidhim laceratuni. Sow. Berk., "Eng. Flor.," vol. v. p. 373. 

 Sow., t. 318. Grev., "Flor. Edin.," p. 447. Johnst., "Flor. 

 Berw.," vol. ii. p. 107. 



Roestelia /acerata, Tul. Cooke, "Hdbk.," p. 534; "Micro. 

 Fungi," 4th edit., p. 190, t. ii. figs. 22-26. Grev., t. 209. 



Exsiccati. 



Cooke, i. 2, 125; ii. 442, 640; " L. F.," 50. Berk., 106, in. 

 Vize, "Micro. Fungi," 129; "Micro. Fungi Brit.," 38, 69. 



^cidiospores on Cratcegus oxyacantha, Fyrus communis, June 

 to August. 



Teleutospores on Jmiipems communis, April to May. 



Biology. — -The teleutospores germinate within twenty-four hours 

 after being placed in water, and the promycelial spores, when applied 

 to Cratcegus, give rise in ten or twelve days to the scidiospores. This 

 culture is very easy to make. I have done it sixteen times, and had 

 no failure. A certain number of failures have followed my cultures 

 of the promycelial spores on Pyrus communis, but still I have suc- 

 ceeded often enough to prove the metoecism. The pseudoperidia on 

 pear are similar to those on thorn, and can be distinguished at a glance 

 from R. cancellata. Rdthay states that a^cidiospores occur also on P. 

 torniinalis and Cratcegus nwnogyna in addition to the above-named 

 plants (" Untersuch. liber die Spermogonien der Rostpilze," pp. 20, 

 22. Wien: 1882). 



The converse culture of the jecidiospores on juniper I made in 1884. 

 On June 25, a small juniper was infected with the cecidiospores ; on 

 July 8, many of the leaves began to turn yellow, these during the 

 summer and autumn fell off, leaving bare places on the branches, and 

 giving the bush a very peculiar appearance ; in December, 1885, these 

 bare places began to swell ; and on April i, 1886, the teleutospore-masses 

 were produced. Thus it will be seen that the iiecidiospores recpiire 

 two years in which to perfect the development of perennial teleuto- 



