на ы. о ou Хазар». айық 
1914) 
OVERHOLTS—THE POLYPORACEZ OF OHIO 83 
of the genera, and in the separation of the species only where 
experience has shown that the spores are always easily obtained. 
In many cases it is impossible to obtain spores, especially if they 
be uncolored, from the hymenium of dried plants. However, 
when plants are taken in the fresh condition it is usually a 
simple matter to obtain them by leaving the fungus over 
night in a moist atmosphere and allowing the spores to fall upon 
a glass slide. Spores of the perennial woody forms may often 
be obtained by this method when an examination of the same 
material in the dried state does not reveal their presence. In 
this paper spore measurements have been freely taken from 
other publications, both European and American. This was 
done in order that the descriptions might be made more com- 
parable. Due credit is given to the author in every case where 
this was done. 
An effort has been made to make the descriptions exactly 
comparable one with another. For this purpose a definite 
sequence of presentation has been arranged for the different 
characters and this order preserved in all but a few instances 
in which entire descriptions were taken from the original sources. 
In the comments following each species the characteristic 
specific distinctions are pointed out and references are made to 
illustrations of one sort or another that give a good idea of the 
plant as the writer understands it. Practically all of these 
references are to papers published in this country. The writer 
has had access to all of the important publications on the family, 
both European and American. Most of the European writings 
are not available to a large part of those students for whom this 
paper is intended and it was believed that a careful selection of 
citations to the illustrations published in this country would 
be of more value than citations to the less known and often inac- 
cessible European publications. Those who are in a position 
to look up additional references will have access as well to 
volumes 19 and 20 of Saccardo’s ‘Sylloge Fungorum,’ where an 
exhaustive index to illustrations will be found. 
It is believed that there can be no question of the need of a 
paper worked out along the above indicated lines. No such 
publication exists for any state in the Union and the only aids 
that students have had in determining their collections have 
