348 MELAMPSORA 
Teleutospores. Sori hypophyllous, subepidermal, scattered 
over the leaf singly and in groups, pulvinate, +—? mm, 
blackish-brown, not shining; spores prismatic, rounded at both 
ends, 35—60 x 6—10 w; epispore clear-brown, 1—1} pu thick, 
scarcely thickened above, without evident germ-pore. 
Ceomata on Allium Cepa, A. ursinum and other species, 
May; uredo- and teleutospores on Populus nigra, P. balsama- 
fera. (Fig. 260.) 
The description is chiefly after Klebahn. The teleutospores mature in 
February of the following year; I find them shorter than given above, 
viz. 25—32 p, and somewhat truncate at the summit. The czoma of 
species of Melampsora on Allium is easily distinguished from the xcidium 
of Puccinia Winteriana on the same host by the absence of a peridium. 
(2) Metampsora Larici-poputina Kleb. 
Caeoma Laricis Plowr. Ured. p. 262 p.p. 
Melampsora populina Lév.; Plowr. Ured. p. 242 p.p. (see note, 
“ Biology,” p. 243). 
M. Larici-populina Kleb. in Zeitschr. f. Pflanzenkr. 1902, xii. 43. 
Fischer, Ured. Schweiz, p. 502, f. 316. 
4Aicidiospores. Ceeomata on hardly perceptible spots, scarcely 
1 mm. long, bright yellowish- orange; spores oval or roundish, 
17—22 x 14—18 uw; epispore 14—2 4 thick, colourless, finely 
verruculose. 
ete xO eee 
i 
Fig. 261. Mf. Larici-populina. a, teleutospores; b, uredospores and 
paraphysis, On P. ontariensis, 
Uredospores. Sori mostly hypophyllous, in little groups, 
causing yellowish angular spots on the upper side, rarely 
