T40 British Uredinea: and Ustilagine^. 



Uromyces ervi. (Wallr.) 



^Ecidiospores — Scattered over both surfaces of the leaves and on the 

 stems. Pseudoperidia cyHndrical or abbreviated, with torn 

 white edges. Spores subglobose, orange, often polygonal, 

 IO-I2/X in diameter. 



Teleutospores — Sori oval, elliptical or linear, shining black, per- 

 sistent, erumpent, mostly cauline. Spores ovate or subglobose, 

 smooth, brown, apex thickened and darker, rounded or flat- 

 tened, often with a blunt conical incrassation, io-12/x high 

 3°~35 X i5~2 5/*. Pedicels brown, long, firmly attached, 

 stout. 



Synonym. 

 A^.cidiuni ervi. Wallr., " Flor. Crypt. Germ.,'" vol. ii. p. 247. 



On Vicia hirsiita {Ervum hirsutum, L.). 



^cidiospores, May to June and August to October ; teleuto- 

 spores, from July, lasting on the dead stems through the winter. 



Biology. — Intermixed with the teleutospores occasionally are 

 found a few ovate, pale brown uredospores, 20 x \o^. This species 

 morphologically closely resembles U. orobi, fabce, and pisz; but I 

 found, in 1886, that the germinating teleutospores, when placed on 

 young plants of Piston sativum., Faba vulgaris, and a vetch seedling, 

 produced no effect (Exp. 623, 645, 646, 647). In 1888, no result was 

 obtained on Vicia cracca, safiva, and Latliyrus pratensis, but only 

 upon Ervuni Jiirsutiim (Exp. 813 to 827). 



V. MICRUROMYCES. Schrot. 



Having only teleutospores, which germinate after a period of rest. Rarely 

 there are found hidden between the teleutospores a few solitary uredospores. 



Uromyces ficariae. (Schum.) 



Teleutospores — Sori numerous, amphigenous, in more or less 

 rounded clusters. Spores mostly ovoid, obovate, or pyri- 

 form, smooth, brown ; the apex of each has usually a wart- 

 like, pale brown papilla, 25-44 x 16-26/x. Pedicels short, 

 colourless. 



