ON CYPERACE 247 
downwards, smooth, brown, darker at the apex, 45—80 x 18— 
22 4; pedicels brownish-yellow, persistent, 25—40 w long. 
4Ecidia on Senecio Jacobaea, May and June; uredo- and 
teleutospores on Carex arenaria, July—May. Rare; Norfolk, 
Lincolnshire, Aberdeen, Burntisland. (Fig. 190.) 
The life-history of this parasite was investigated by Plowright, who at 
the same time demonstrated by his experimental cultures its distinctness 
from Puceinia Caricis and P. arenarticola. Fischer records (l.c.) an 
ecidium on Senecio Jacobaea, S. aquaticus and S. erucifolius closely 
resembling this, but points out at the same time that C. arenaria does 
not grow in Switzerland ; if, therefore, it is the same fungus, as it seems 
without doubt to be, its alternate stage must occur there on some allied 
species of Carex, such as C. disticha. 
DistRiBuTion: Germany, Holland, Switzerland (?), Russia. 
113. Puccinia arenariicola Plowv. 
Puccinia arenariicola Plowr. Journ. Linn. Soc. Bot. xxiv. 90; Ured. 
p. 170. Sace. Syll. ix. 311. Sydow, Monogr. i. 661. 
4icidiospores. Aicidia generally hypophyllous, in round 
clusters on circular yellow spots which 
are as much as 1 cm. diam. and margined 
with purple, cup-shaped, yellowish, with 
torn revolute margin; spores nearly 
smooth, yellow, 15—20 u. 
Uredospores. Sori on yellowish spots, 
linear or oblong, surrounded by the torn 
epidermis, brown; spores globose to 
ovate, delicately echinulate, pale-brown, 
18—22 p. 
Teleutospores. Sori generally hypo- 
phyllous, scattered or sometimes aggre- 
gated, oblong, as much as 1 mm. long, eT ae 
pulvinate, black; spores clavate or ob- — Aicidia on leaf of ‘Cen- 
long-clavate, rounded above where they pa a 
are darker and much thickened (14,), __right’scultures(reduced). 
gently constricted, tapering downwards, 
smooth, brown, 40—65 x 14—22 w; pedicels brownish, persis- 
tent, as much as 40 w long. 
