204 PUCCINIA 
On Viola palustris. Rare; 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 
the 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. 
P. asarina Cooke, Handbook, p. 504, Plowright, Uredinez, p. 202 (non 
K. et §.), is this species, a mistake having been made in identifying the 
host-plant. 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 P. Fergussoni they are entirely hypophyllous. 
DistrisuTion : Northern Europe, North America (?). 
76. Puccinia argentata Wint. 
Aeidium argentatum Schultz, Prod. Flor. Starg. p. 454 (1806 ; teleuto- 
spores, on Impatiens). 
Trichobasis Impatientis Rab. ; Cooke, Micr. Fung. p. 225. 
Puccinia Noli-tangeris Corda, Icon. iv. 16, pl. 5, f. 57 (1840). Cooke, 
Handb. p. 504; Micr. Fung. p. 210. 
P. argentata Winter, Pilze, p. 194 (1884). Plowr. Ured. p. 193. Sace. 
Syll. vii. 639. Sydow, Monogr. i. 450. Fischer, Ured. Schweiz, 
p. 143, £. 109. 
[Spermogones. Hypophyllous, scattered among the ecidia, 
honey-coloured. 
Aicidiospores. AKcidia hypophyllous, pretty uniformly dis- 
tributed on discoloured swollen 
iB al a) spots, on the petioles and 
stems more scattered, white, 
with a deeply-cut revolute 
- margin ; spores 18—22 x 13— 
CD 20 2; contents golden-yellow. ] 
Uredospores. Sori hypo- 
Fig. 152. P. argentata. Teleutospores, phy lous, scattered we circinate, 
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, 
