134 British UredinecE and Ustilagine<T. 



Biology. — I have no acquaintance with this as a British species, 

 and the host-plant of its aecidiospores is not native in this country. Its 

 hfe-history was worked out by Schroter, who states that the teleuto- 

 spores occur on Vicia cracca, Pisum sativmn, Lathyrus pratensis and 

 sylvestris. He further finds that another aecidium on E. cyparissias 

 produces another Uromyces — U. siriatus, with brown teleutospores ; 

 which, when recent, are dehcately striate with wavy Hues, and which 

 have a flat conchiform brown cap over the germ-pore. The latter 

 occurs on Lotus corniadatus, TrifoHuni arvense, Medicago sativa^ etc. 



II. BRACHYUROMYCES. Schrot. 

 Having spermogonia, uredospores, and teleutospores. 



III. HEMIUROMYCES. Schrot. 

 Having only uredospores and teleutospores, which occur on the same host- 

 plant. I , 



Uromyces scutellatus. (Schrank.) 



Uredospores — Sori small, roundish, at first covered by the epi- 

 dermis. Spores scanty, mixed with the teleutospores, roundish 

 or subpyriform, with a thick colourless or yellowish-brown 

 spore-membrane, smooth, verrucose or finely echinulate, 20- 



35 X 15-25/^- 

 Telejitospores — Irregular, rounded, ovate, or oblong, apices of the 

 spores often surmounted with a broad, flat, pale or colourless 

 papilla. Spores brown, smooth, tuberculate or reticulate, 

 20-40 X 15-25//-. Pedicels rather long, deciduous. 



Synonyms. 

 Lycoperdon scutellatuni, Schrank. " Baiersch Flor.," vol. ii. 

 p. 631. 



Uredo excavata, D. C. " Synop. Plant.," p. 47. 



Uromyces scutellatus, Lev. Cooke, " Grevillea," vol. vii. p. 137, 



in part. 



Uromyces excavatus, D. C. Cooke, " Grevillea," vol. vii. 

 p. 138; "Micro. Fungi," 4th edit., p. 213. 



Uromyces scutellatus (Schrank). Winter in Rabh., "Crypt, 

 Flor.," vol. i. p. 144- 



On various Euphorbia (?). 



