2 44 British Uredine(^ and Ustilaginecs. 



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, Lev. 



Melampsora betulina, Desm. Cooke, " Hdbk.," p. 522; 

 "Micro. Fungi," 4th edit., p. 219, t. ix. figs. 189, 190. 



Exsiccati. 



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 ascidio- 

 spores of the Melampsora; are to be found amongst the Caeomata, and 

 from the fact that the only station in which I find C. orchidis is under 

 a birch-tree that is annually affected with M. belielino', 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 Lonicera periclymemim grows not 

 very far off, I tried the germinating teleutospores on Lonicera (Exp. 

 1 13, 1 13«, 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/^. 



* Since Rostrup pointed out, in 18S3, the connection between the Melamp- 

 sorse and the Cccomata, 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. 



