150 Illinois State Laboratory of Natural History. 
(2). Inthe Uredinee the names of the teleutospore and 
uredospore stages are alone considered in the question of prior- 
ity. Aicidial names are not recognized, mainly from the un- 
certainty that exists as to the genetic connection of the forms, 
as well as from the obscurity of descriptions, and the inferior 
value of herbarium specimens as types. 
(8). The name of the author responsible for the specific 
appellation has been appended, being inclosed in parenthesis in 
case the generic association has been changed; and the name 
of the author of the binomial combination, whether the parts 
were adopted from others or not, finally follows. In quite a 
number of cases this author is not known to us, owing to the 
too prevalent habit of omitting the citation. 
The descriptions of species are taken from nature, and as 
far as possible from typical or average specimens. The mea- 
surements given are intended to include the variations which 
commonly occur in such specimens; but the extreme limits of 
exceptionally large or small spores are not indicated. In most 
cases the measurements were made of spores immersed in a so- 
Iution of potash, so as to obtain the size of the mature but 
undried specimens. For the study of the surface markings, ex- 
aminations were made when necessary of spores either dry or 
wetted with pure water, whichever method was found from 
experience to produce best the particular effects required. The 
color given is as closely as possible that of nature rather than 
an interpretation of the appearance of a few spores in the field 
of the microscope. It need scarcely be said that the tint is 
much lighter in the latter case. , The best objectives of different 
makers were used, and for the closer studies a magnifying 
power of about five hundred diameters was employed. 
It has been deemed worth the while to quote the descrip- 
tion given by another author; usually, when accessible, the 
original description of the species in each case. The quoted 
descriptions are printed in different type, and are followed by a 
reference, with name, date, and page, of the work from which 
the extracts are made. 
Notes are appended when required; these follow the col- 
lector’s numbers and designations of localities, and are intended 
to record any special facts about, or information upon, the 
