I 26 British Uredinccs and Ustilaginccr. 



Uromyces geranii. (D. C.) 



^(r/^/^j-/^n'jr^Pseudoperidia crowded in irregular or roundish 

 patches on reddish spots, shortly cylindrical, edges white, at 

 first adpressed, afterwards recurved, toothed. Spores roundish, 

 finely verrucose, orange, 20-30 X 15-20/A. 



Uredospores — Sori dark chestnut-brown, in rounded groups, small 

 rounded, soon naked. Spores spherical, shortly elliptical, 

 echinulate, pale brown, 20-25 X 19-231U. 



Teleutospores — Sori blackish, rounded, often circinate. Spores 

 elliptical or pyriform, with a colourless wart-like papilla on 

 the summit, smooth, brown, 20-25 x 17-23/^. Pedicels 

 short, deciduous. 



Synonyms. 



Uromyces geranii {V). C). Winter in Rabh., " Krypt. Flor.," 

 vol. i. p. 160. 



Uredo geranii. D. C, " Synop. Plant.," p. 47. Berk., " Eng. 

 Flor.," vol. V. p. 380. Sow., t. 398, fig. 5. Grev., "Scot. Crypt. 

 Flor.," t. 8; "Flor. Edia," p. 434. Johnst., "Flor. Berw.," vol. ii. 

 p. 201. 



Trichobasis geranii, Berk. Cooke, " Hdbk.," p. 530. 



yEcidium geranii, D. C. Cooke, "Micro. Fungi," 4th edit., 

 p. 199; "Hdbk.," p. 543. Berk., "Eng. Flor.," vol. v. p. 371. 

 Johnst., "Flor. Berw.," vol. ii. p. 205. 



Uromyces geranii. Cooke, "Micro. Fungi," 4th edit., p. 213; 

 "Grevillea," vol. vii. p. 134. 



Exsiccati. 

 Cooke, i. 107, 440; ii. 50. 



On Geranium sylvaticum, pratense, dissechim, and violle. 

 May to October. 



Biology.— -At the Mycological Conference in Paris, in 1887, Dr. 

 Richon exhibited a figure of the uredospores accompanied by large 

 clavate, hyaline paraphyses, but I have not observed these in any 

 British specimen I have examined. The eecidiospores often cause 

 great distortion when they occur on the stems. On the leaves they 

 usually occur on reddish spots. Professor Trail finds this fungus 

 near Aberdeen, on the two first-named host-plants, but not upon G. 

 disscctinn or mollc. 



