MELAMPSORELLA 361 
Jelampsora Cerastit Wint. Pilze, p. 242 (1881). Plowr. Ured. p. 247. 
Melumpsorella Cerastii Schrot. Flor. Schles, p. 366 (1887). Sace. Syll 
vii. 596. 
M. elatina Arthur, N. Amer. FI. vii. 111. 
Spermogones. Epiphyllous, scattered, conical, honey-coloured. 
Aicidiospores. Aicidia hypophyllous, arranged in an irregu- 
lar row on each side of the mid-rib, erumpent, 
shortly cylindrical, roundish or compressed, 
pale orange-red, with torn white margin; 
spores ellipsoid or polygonal, orange, 16— 
30x 14—17 4; epispore thin, densely verru- i 
cose. aa 
Uredospores. Sori generally hypophyl- y 
lous, usually arising beneath a stoma, sur- 
rounded by a peridium which slowly opens 
by an apical pore, small, crowded, pustular, Beene a 
yellow; spores sometimes in short chains, — dermium elatinum, 
ovoid-oblong or ellipsoid, yellowish, 20—30 alighely Leen 
x 16—-21 4; epispore thin, beset with a 4, aleaf, x10. 
small number of pointed warts which are 
only visible when dry, with an occasional glabrous strip (?), 
without perceptible germ-pores. . 
Teleutuspores. Hypophyllous, often covering the whole leaf, 
developed within the epidermal cells, whitish-yellow or pinkish, 
in little groups in each cell, roundish or flattened, one-celled, 
1421 yw; epispore smooth, thin; basidiospores globose, nearly 
colourless, 7—9 p. 
Aividia on leaves of Abies pectinata, June—September ; 
uredo- and teleutospores on Cerastiwm arvense, C. triviale and 
its var. alpestre, C. viscosum, Stellaria graminea, S. media 
(more rarely); uredospores from May onwards. Not very 
common. (Figs. 269, 270.) 
In North America it occurs on other species of Adzes, and on Alsine 
and other species of Cerastium ; also in Europe on numerous allied species 
of the subfamily Alsinee. The teleutospores are developed on those 
leaves of the second host which live through the winter ; they germinate 
about May and can infect the Silver Fir. There are comparatively few 
records of the ecidium-stage in this country; it causes small erect 
