

go 
ON THE RECENT ADDITIONS TO OUR 
KNOWLEDGE 
OF THE 
UREDINEZ AND USTILAGINEA 
WITH SPECIAL 
REFERENCE TO THE BRITISH SPECIES. 
BY CHARLES B. PLOWRIGHT, M.D. 
PRESIDENTIAL ADDRESS. 

published, but since then so many and so active have been 
the workers in this particular branch of study that it 1s 
essential for us to have an outline of what has been done if we 
would not be entirely leit behind the times in matters 
mycological. _ Klebahn and Dietel in Germany, Fischer im 
Switzerland, Eriksson in Sweden, Rostrup in Denmark have 
year after year added fresh facts to our store of knowledge, while 
Magnus as vigorous as of yore, Hartig, Juel, Chodat, Tranzschel, 
Henning, Lagerheim, De Toni, Pazschke, Brefeld, Setchel, Kuhn 
Cocconi, Richards, Swingle, Wagner, Bubak, Marshall Ward, 
Barclay, Jacky and others have each added their modicum. 
Nor are we likely to forget our friend the late Mr. H. I. Soppitt, 
who was with us at our last meeting and to whom we owe SO 
much. We can but regret he was never in a position during his 
short but active life to have devoted his whole energies to this 
subject, in which case we should not have needed to have gone 
abroad for the elucidation of so many life histories. 
These fungi constitute such an economically important group 
of the Basidiomycetes that it is not surprising they should have 
received so much attention. The remarkable character some of 
them possess of changing their host from one _ species of 
phanerogam to another has no doubt been the attraction (0 
many biologists to investigate their development. 
J oe ten years ago, a monograph of these fungi was 

