Melampsora. 243 
On Populus nigra, balsamtfera, ttalica, 
June to November. 
BIOLOGY.—Rathay states that the zcidiospores of this species are 
4c, clematidis. 1 have applied the germinating teleutospores from 
P. pyramidalis in four cultures to Clematis vitalba, but could obtain 
no result. Schréter thinks that Ceoma alliorum, in part at least, 
belongs to this Melampsora; I have tested this statement by culture 
on Allium ursinum, but without result. 
Melampsora hypericorum. (D. C.) 
Credospores—Sori orange, small, pulverulent, scattered, mostly 
hypophyllous. Spores globose or elliptical, finely echinulate, 
orange-yellow, 14-21 X 12-17. Paraphyses absent. 
Teleutospores—Dark brown, small, flat. Spores subcylindrical, 
section polygonal, brown, 25 X 15p. 
Synonym. 
Winter, Zoe. cit, p. 241. Schrot., loc. cit., p. 363. 
Uredo hypericorum. D. C., “Flore frang.,” vol. vi. p. 81. 
Berk., “Eng. Flor.,” vol. v. p. 380. Cooke, “ Hdbk.,” p. 526; 
“ Micro, Fungi,” 4th edit., p. 215, t. vill. figs. 174, 175. 
LExsiccats. 
Baxt., 42. Cooke, i. 118; ii. 321. Vize, “ Fungi Brit,” 56; 
“ Micro. Fungi Brit.,” 127. 
On Hypericum perforatum, androsemum, pulchrum. 
Melampsora betulina. (Pers.) 
Uredospores—Sori pale orange, small, roundish, numerous, flat. 
Pseudoperidia persistent. Spores ovate or oblong, finely 
echinulate, orange-yellow, 25-40 X 10-204, Without para- 
physes. 
Teleutospores—Sori at first yellow, then brown, at length black, 
generally hypophyllous, flat, roundish. Spores cylindrical, 
section polygonal, pale yellow-brown, 50 X 16m. 
Synonyms. 
Winter, loc. cét., p. 238. 
Oreo populina, var. betulina. Pers, “‘Syn.,” p. 219. 
