ON CYPERACEE 245 
111. Puccinia silvatica Schrot. 
Heidium Taraxaci K. et 8. Myk. Heft. i. 85. 
Puccinia silvatica Schrot. in Cohn, Beitr. iii. 68. Plowr. Ured. p. 172. 
Sace. Syll. vii. 627. Sydow, Monogr. i, 656. Fischer, Ured. 
Schweiz, p. 289, f. 211. 
Spermogones. In little clusters, yellowish. 
Acidiospores. /Ecidia hypophyllous or amphigenous, on 
roundish yellow or brown spots, in crowded 
clusters 2—5 mm. wide, rarely solitary, occa- 
sionally on the peduncle which they distort, 
cup-shaped, with torn whitish revolute mar- 
gin; spores nearly smooth, orange, 14—21 y. 
[Uredospores. Sori hypophyllous, scat- 
tered, minute, oblong, brown; spores globose 
to ovate, echinulate, brown, 20—27 x 15— 
22 pw. 
Teleutospores. Sori hypophyllous, scat- 
tered, minute, roundish or oblong, reaching 
1 mm. in length, pulvinate, black; spores cla- 
vate, rounded and much thickened (up to 11 p) 
above, rarely conically attenuated, gently con- 
stricted, tapering below, smooth, pale-brown, pig, 199. P. sil- 
darker at the apex, 85—55x12—18y; pedicels  *atica._— Mcidia 
on leaf of Tarax- 
brownish, persistent, as much as 40 yw long.] acum, from one 
; of Soppitt’s spec- 
Acidia on Taraxacum officinale, June, — imens, Saltaire. 
July. I have seen specimens from both 
England and Ireland. Teleutospores on species of Cures. 
(Fig. 189.) 
The question whether P. silvatica occurs in Britain is still in the same 
state as in Soppitt’s time. The ecidium agrees with the one assigned 
to that species, but the teleutospores have not been found; there is no 
evidence that those found on Carex remota at Kew belonged to this species. 
The distinction of this ecidium from that belonging to P. variabilis lies 
chiefly in the clustered peridia, which are situated on a thickened part of 
the leaf, the peridium-cells are arranged in evident rows and the spores 
form, according to Juel, longer chains. Fischer insists that the peridium 
cells are thickest on the outer side, while those of P. variabilis are thickest 
on the inner side: he maintains that this difference is characteristic of 
