136 British Uredinecr and UstilaginecE. 



Uredo apicitlosa, Link. Berk., " Eng. Flor.," vol. v. p. 382. 

 Purton, "Midi. Flor.," vol. iii. p. 297. Grev., "Flor. Edin.," 

 p. 436. 



Trichobasis rumicum^ D. C. Cooke, " Micro. Fungi," 4th edit., 

 p. 225. 



Uromyces apiailosa, Lev. Cooke, "Hdbk.,"p. 518; "Micro. 

 Fungi," 4th edit., p. 212, t. vii. figs. 154-155. 



Uromyces rumicu»i, Lev. Cooke, " Grevillea," vol. vii. p. 136. 



Exsiccati. 



Cooke, i. 318, 322; "L. F.," p. 26. Vize, '^ Fungi Brit.," 

 63, 55 ; "Micro. Fungi Brit.," 225. 



On Rumex conglomeratus, obtiisifoliiis, crispus, hydrolapathum, 

 acetosa. May to September. 



Biology. — The sori are often accompanied by very little dis- 

 coloration of the foliage, but the presence of the mycelium often 

 causes those parts of the leaf which are adjacent to the sori to retain 

 their original green colour long after the unaffected portions of the 

 leaves have become yellow from age. Sometimes, however, on 

 R. acetosa there is considerable red discoloration. 



Uromyces sparsus, (Kze. and Schm.) 



Uredospores — Sori on pale spots, often convex, round or elliptical, 

 amphigenous or cauline, long covered, at length surrounded 

 by the ruptured epidermis. Spores round or oblong, 20-23/A 

 in diameter, to 30/x in length. 



J eleutospores — Round or ovoid, frequently attenuated below, 

 brown, smooth, epispore thickened above, sometimes hooded, 

 30-40 X 15-24/X. Pedicels long and persistent. 



Synonyms. 



Uromyces sparsus (Kze. and Schm.). Winter in Rabh., 

 "Krypt. Flor.," vol. i. p. 148. 



Uredo sparsus, Kze. and Schm. " Deutsch. Schwamme," 170. 



Uromyces sparsa, Lev. Cooke, " Hdbk.," p. 5 19 ; " Grevillea," 

 vol. vii. p. 137; "Micro. Fungi," 4th edit., p. 214. 



On Spergiilaria nihra. May to July. 



