Sept. 1906 ] A New Classification of the Uredinales 
191 
the Philadelphia code. This course will doubtless be accepted 
as natural, whether considered best or not, seeing that the author 
was a member of the committee that drafted the code, and that 
he has on several subsequent occasions affirmed his belief in the 
essential validity of the principles which underlie the code. 
Granting the method of procedure, there is no need in this place 
to take up the question of the correct application of the several 
names; that may for the present be left to others. There are 
two names, that the establishment of types and application of 
the rule of priority have brought uppermost, i. e., Uredo and 
Aecidium, which mav lead to some confusion and inconvenience. 
Yet the number of species in the true genus Uredo and true 
genus Aecidum as distinguished from the form genera of these 
names, are so few, that the little inconvenience may be endured 
for the sake of correct method and final result. It is noteworthy 
that Aecidium as a genus name, supplied the basis, according to 
many authors, for the name of the order, while Uredo since 1825 
has been chiefly employed in this way, and is now firmly estab¬ 
lished as the genus on which the order Uredinales is founded. 
A word may be said by way of explanation regarding the 
method of citation. The manuscript was prepared in accordance 
With the American method, bub the printed proof submitted 
showed an evident editorial intention to have it changed to the 
German method, an intention most imperfectly carried out by the 
compositor. The typographical errors may be ascribed to the 
intricacies of this transformation, which diverted attention be¬ 
longing to legitimate proof reading. 
There is one question which is likely to come up in the mind 
of the reader, which finds no answer in the published article, 
that is, regarding the status of such forms as are too imperfectly 
known to be placed with much confidence in any of the recog¬ 
nized genera. The author proposes in his own work to retain 
such names as Peridermium, Caeonia, Roestelia, Uromyces and 
Puccinia as form genera for imperfectly understood species, and 
even Uredo and Aecidium in their customary acceptance as form 
genera, if a better course does not become evident. These will 
constitute an Anhang for recording undistributed and imperfectly 
known forms. 
Purdue University, Lafayette, Indiana. 
