-34 A SYNOPSIS OF THE BRITISH ACIDIACEI. 
PERIDERMIUM, Chev. 
Peridium elongated, at length bursting irregularly. Spermogonia 
scattered, conspicuous. 
4, Peridermium Pini, Chev.; peridia oblong, scattered, large; spo- 
ridia orange, abundant ; spermogonia vernal or autumnal, or both ; sper- 
matia large, white.— Cooke, l. e. n: 1410; Berk. Outl. p. 336. 
Æcidium Pini, Pers. Syn. 213; Grev. Se. Cr. Fl. t. 1 ; Eng. Flora, v. 
pl. 2; Fl. Devon. pt. ii. p. 4.—On leaves and young branches of Scotch 
Fir. Common in Scotland, occasional in England. | Summer. 
. Peridermium elatinum, Lk.; simple, immersed; peridia elliptic, 
pallid ; sporidia  orange.— Cooke, l.c. n. 1411; Link, Obs.; Kee. et 
Sch. Deutsch. Schw. n. 141; Berk. Outl. p. 336. . /Ecidium elatinum, 
Alb, et Schw. Consp. n. 337.—On Silver Fir, altering both foliage and 
ramification. Not common. 2 
JEcIDIUM, Pers. 
Peridium seldom elongated, opening by a terminal mouth, sur- 
rounded by a fringe of recurved teeth, or when short bursting irregu- 
larly. Spores disposed in chains. Spermogonia on the same or the 
opposite surface, clustered or scattered, central or intermixed. 
a. Peridia scattered (not collected in tufts or clusters). 
6. Heidium leucospermum, DC. (White-spored Aicidium); spots 
yellowish ; peridia scattered, often covering the whole under-surface ; 
sporidia white, ovate.—Cooke, 4. e. 1. 1412; DC. Fl. Fr. p.239; Berk. 
Outi. p. 837; Eug. Flora, v. pt. 2. p. 971. JE. Anemones, Pers. 
Syn. 212. Lycoperdon innatum, With. iv. p. 456. L. Anemones, 
Pulé. Linn. Tr. ii. p. 311.—0On both sides of the leaves of the Wood 
Anemone. Common. June. 
T. Æcidium quadrifidum, DC. (Four-lobed Æcidium) ; spots brown- 
ish; peridia seattered, occupying almost the entire under-surface ; 
sporidia brown, subglobose.—CooRe, J. c. n. 1413; DO. Fl. Fr. vi. 
p. 90; Berk. Outl. p. 931; Eng. Flora, v. pt..2.. p. 311.—0On the 
under side of leaves of Anemone in gardens. Lobes at the mouth of 
the peridium not constantly four. April to May. i 
8. Aecidium albescens, Grev: (Moschatel Æcidium); leaf blistered, 
whitish, scattered ; peridia white, split into a few large teeth; sporidia 
yellowish-white.—Cooke, l.e: n. 1414; Grev. Fl. Ed. p. 444; Sohnst. 
FL. Berw. p. 205 ; Berk. Outl. p. 337; Eng. Flora, v. p. 312.. JE. 
