22 2 British UrcdiiiecB and Ustilaginec?. 



spherical, elliptical, ovate, generally 20-22 x 16-20/^, finely 

 echinulate. Paraphyses abundant, swollen above, curved. 

 Teleutospores — Sori black, pulvinate. Spores cylindrical, cells 

 four to six, 50-70 X 20-22/A, constricted, apex rounded or 

 slightly pointed, sometimes surmounted with a brown blunt 

 point. Pedicels ioo-150/x, long, colourless, rather firm. 



Synonyms. 



Schrot., loc. cit, p. 352. 

 Piiccinia potentillce. Pers., "Syn.," p. 229. 

 Uredo oblusa, Strauss. 

 Uredo poientillaruin, D. C. 

 Phragmidiuni potentilla, Winter. 



Phragmidiiim obtusatum, Fries. Cooke, " Micro. Fungi," 4th 

 edit., p. 201, in part. 



Ph7-agmidium potentilla. Schrot., loc. cit., p. 352. 



On Poteutilla argentea and various cultivated species. 

 May to November. 



Phragmidium tormentillae, Fckl. 



yEcidiospores —^Qi&viMvcvg those oiPh.fragariastri. 



Uredospores—?>ox\ round, small, orange-red, punctiform. Spores 

 spherical or ovate, finely echinulate, reddish orange, 20-23 x 

 17-20//-. 



Teleutospores— ^on small, round, punctiform, pale brown. Spores 

 cylindrical, cells three to ten, generally five to eight, often 

 curved, clear brown, smooth, apex rounded or pointed, 

 100-160 X I6-22/X. Pedicels long (loo/x), equally thick, 



colourless. 



Synonyms, 



Schrot., loc. cit., p. 352. 



Phragmidium torine^itillce. Fckl, " Symb. Myc," p. 46. 



Uredo potentillarum, D. C. Berk., " Eng. Flor.," vol. v. p. 382. 

 Sow., t. 398, fig. 2. 



Pnccinia potcntillcE. Grev., t. 37, in part. 



Aregma obtusatum, Fries. Berk., " Eng. Flor.," vol. v. p. 359- 



Phragmidium obtusatum, Fries. Cooke, " Hdbk.," p. 491; 

 "Micro. Fungi.," 4th edit., p. 201, t. iii. fig. 35. 



