204 PUCCINIA 



On Viola palustris. Bare; Wales, Scotland, and near 

 Birmingham. The beginnings of the sori may be seen by the 

 middle of May. (Fig. 151.) 



This species is easily recognised by its large and pulvinate groups of 

 sori. The mycelium spreads considerably beyond the part occupied by 

 th^ spores, and consequently causes large yellow patches, usually only one 

 or at most two on each leaf, each the result of a separate infection by the 

 basidiospores. 



/'. asarina Cooke, Handbook, p. 504, Plowright, Uredinese, p. 202 (non 

 K. et S.), is this species, a mistake having been made in identifying the 



• i ilant. In continental specimens of P. asarina Kunze, so far as I have 

 seen, the sori on the lamina are as frequent on the upper leaf-surface 

 as on the lower, whereas in /'. Fergussoni they are entirely hypophyllous. 



Distribution : Northern Europe, North America (?). 



7(>. Puccinia argentata Wint. 



JEcidivm argentatum Schultz, Prod. Flor. Starg. p. 454 (1806 : teleuto- 



spores, on Impatiens). 

 Trichnbad* Impatientis Rab. ; Cooke, Micr. Fung. p. 225. 

 Puccinia Noli-tangeris Corda, Icon. iv. 16, pi. 5, f. 57 (1840). Cooke, 



Handb. p. 504 ; Micr. Fung. p. 210. 

 P. argentata Winter, Pilze. p. 194 (1884). Plowr. Fred. p. 193. Sacc. 



Syll. vii. 639. Sydow, Monogr. i. 450. Fischer, Ured. Sehweiz, 



p. 143, f. 109. 



[Spermogones. Hypophyllous, scattered among the secidia, 

 honey-coloured. 



JEcidiospores. iEcidia hypophyllous, pretty uniformly dis- 

 tributed on discoloured swollen 

 spots, on the petioles and 

 stems more scattered, white, 

 with a deeply- cut revolute 

 margin ; spores 18 — 22 x 13 — 

 20 ft ; contents golden-yellow.] 

 Lredospores. Sori hypo- 

 phyllous, scattered or circinate, 

 rig. 152. P. argentata. leleutospores, . . . 



from the original specimen (L. Jenyns). sometimes on minute yellowish 



spots, often confluent, covered 

 by the silvery epidermis, then pulverulent, roundish, ochra- 

 ceous; spores globose to broadly ellipsoid, delicately echinulate, 



