238 Br'itish UrcdinecE and Ustilagine(2. 



Melampsora farinosa. (Pers.) 



Uredospores — Hypophyllous, roundish, scattered or clustered, often 

 disposed in a circular manner, soon pulverulent, orange. 

 Spores more or less globose, epispore echinulate, hyaline, con- 

 tents golden-orange, germ-pores two, opposite each other, 

 17-22 X 13-15/X. Paraphyses very numerous, clavate, straight 

 or slightly curved below, swollen and obtuse above, hyaline, 

 40-60 X 1 5- 1 7/^5 smooth. 



Teleutospores — Epiphyllous, without spots, always covered by the 

 epidermis, in clusters, often confluent and forming thick crusts, 

 flat, firm, at first orange, then brown, at length blackish. Spores 

 cylindrical, rather narrower below, smooth, pale brownish, 

 40-45 X 16-17/X. 



Synonyms. 



Schrot., " Krypt. Flor. Schl.," vol. iv. p. 3'6o. 



Uredo farinosa,Ytx%. "Syn.,"p. 217. Purton, " Midi. Flor.," 

 vol. iii. p. 298. Johnst., " Flor. Berw.," vol. ii. p. 200. Grev., 

 "Flor. Edin.," p. 437. 



Uredo caprearum. Berk, " Eng. Flor.," vol. v. p. 385. 



Lecythea caprearum, Berk. Cooke, "Micro. Fungi," 4th edit., 

 p. 222. 



Uredo saliceti, Lev. Cooke, " Micro. Fungi,." 4th edit., p. 221. 



Melampsora salicina, Lev. Cooke, " Hdbk.," p. 522 ; " Micro. 

 Fungi," 4th edit., p. 219, t. ix. figs. 191, 192. 



Melampsora salicis caprecz, Pers. Winter, loc. cil., p. 239. 



ISxsiccati. 



Cooke, i. 55, 85; ii. 69, 155; " L. R," 49. Vize, "Micro. 

 Fungi," 51 ; "Micro. Fungi Brit," 67, 2'32. 



On Salix caprea, ati?ita, cinej'ea, i-eticulata. 

 June to November. The teleutospores germinate in March 

 and April. 



Biology. — Rostrup and Nielsen state that the secidiospores of 

 this species are CcEoma euoiiymi. In 1884, I applied the germinating 

 teleutospores from Salix capreato a small plant oi Eiionyjiius eiiropa;iis 

 on three separate occasions (March 17, April 6, and May 14), but no 

 result followed. In 1885, I repeated the experiment with the same 



