DESCRIPTIONS OF THE BRITISH 

 UREDINE^. 



UREDINEJE. Tulasne. 

 Mycelium parasitic in living plants. Spores formed from the 

 ends of erect, crowded hyphce, usually of more than one kind. 

 Teleutospores germinating by a short promycelium. 



UROMYCES. Link. 



Teleutospores separate, unicellular, pedicellate, produced in 

 flat sori (spore-beds), apex perforated by a single germ-pore. 



I. EUUROMYCES. Schroter. 

 Having spermogonia, secidiospores, uredospores, and teleutospores, the 

 latter germinating only after a period of rest, 



A. AUTEUUROMYCES. 

 Having all spore-forms on the same host-plant, 



Uromyces fabse. (Pers.) 



yEcidiospores — Pseudoperidia generally crowded upon whitish 

 spots, which are more or less circular, short, slightly pro- 

 minent, flat, with torn white edges. Spores subglobose, 

 orange-yellow, finely echinulate, 15-25/xin diameter. 



Uredospores — Sori chestnut-brown, roundish, amphigenous, scat- 

 tered, often confluent, soon naked. Spores subglobose or 

 ovate, with three germ-pores, shortly echinulate, yellowish 

 brown, 20-30 x 17-20/x,. 



Teleutospores — Sori rounded on the leaves, more abundant and 

 elongate on the stems, persistent, black. Spores variable 

 in form, ovate or broadly clavate, dark brown, smooth, apex 

 much thickened (8-1 o/x), rounded or conical with one in- 



