244 British Uredinee and Ustilaginee. 
Uredo cylindrica, Strauss. Berk., “Eng. Flor.,” vol. v. p. 385, 
in part. 
Uredo ovata, Grev., ‘Flor. Edin.,” p. 442. Johnst., “ Flor. 
Berw.,” vol. ii. p. 198. 
Lecythea betulina, Lév. 
Melampsora betulina, Desm. Cooke, “ Hdbk.,” p. 522; 
“Micro, Fungi,” 4th edit., p. 219, t. ix. figs. 189, 190. 
LExstcate. 
Cooke, i. 124; ii. 62. Vize, “ Micro. Fungi,” 140; “ Micro. 
Fungi Brit.,” 230, 
On Betula alba. 
May to November, 
BIOLOGY.—-In the presence of so many assertions that the zcidio- 
spores of the Melampsorz are to be found amongst the Czomata, and 
from the fact that the only station in which I find C. orchzdi's is under 
a birch-tree that is annually affected with WZ. deluding, I have tried 
several cultures by placing the germinating teleutospores on Orchis 
maculata and latifolia (Exp. 256, 284, 343, 672, 674, 675), but always 
without success. As a plant of Lomzcera periclymenum grows not 
very far off, I tried the germinating teleutospores on Lonicera (Exp. 
113, 1134, 114, 136), but with no result. I have also applied the germi- 
nating teleutospores to young healthy birch plants, but of course with- 
out result.* 
II. PUCCINIASTRUM. Otth. 
Teleutospores formed outside the epidermal cells, becoming longitudinally 
or obliquely divided into from two to four cells, 
Melampsora pustulata. (Pers.) 
Uredospores—Sori orange, pustular, often widely confluent, small. 
Pseudoperidia hemispherical, spores subglobose or ovate, 
echinulate, orange-yellow, 14-20 X 10-15 p. 
* Since Rostrup pointed out, in 1883, the connection between the Melamp- 
sore and the Czomata, I have made upwards of forty experimental cultures 
with these species. The results which I have obtained differ so materially 
from those of other botanists, that it is evident several species of Melampsora 
are at present confounded with one another. The satisfactory recognition of 
these can only be accomplished by careful biological research, 
