CLASSIFICATION OF THE UREDINES. 339 
CLASSIFICATION. OF THE UREDINES. 
'HE following letter appears in Grevzllea for September last :— 
The Editor has said more than once that controversies upon 
matters mycological lead to no good; and, believing him to be 
right, I will only say that I have read carefully his remarks on p. 
151. During the past summer I have been working at the phy- 
slology of the Uredines, and although I do not intend here to give 
the details of my experiments, I wish to point out— 
(1) That the teleutospores of Uromyces pow, Rbh. which previ- 
ously had not been met with in Britain, have been found abundantly 
this year on Poe ftrivialts and P. pratensis wherever their grasses 
grow near Aécidium ficariz. 
(2) That the “adium upon Ranunculus repens is connected 
with Uromyces poe, and not, as was stated in my paper, with 
Uromyces dactylidts. 
(3) That “£cidium rumicis is connected with Puccinia arundin- 
acea ;; and that the 4adzum has followed the infection with Puccinia 
Arundinacea spores upon Rumex obtustfolius, crispus, hydrolapa- 
thrum and conglomeratus, and upon the common rhubarb. 
(4) That up to the present time sowing the spores of P. arun- 
dinacea and P. Magnusiam on Rumex acetosa has with me produced 
no Afcidium. 
(5) That as no Puccinia occurs on gooseberry leaves in this 
country it is clear A‘cidium grossulariz, as we find it, is not a 
Pucciniopsis, but is probably a hetercecismal species. 
CHARLES C. PLOWRIGHT. 
7, King Street, King’s Lynn, 
FAUIGS 15, 2803: 
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