88 
it may have been missed by collectors, as on Larix, for example, and may 
subsequently be found; in others, however, it is doubtful if the aecial stage 
occurs here. In this case the species doubtless depends entirely upon its 
urediniospores for reinfection of its host from year to year. Such, for 
instance, is no doubt the case with the Poa rust (P. epiphylla) and the 
leaf rust of cereals and certain grasses (P. Rubigo-vera). 
In view of these facts it seems very doubtful that all of the sixteen 
still unattached telial forms in the Siate have their respective aecia here. 
In the first place, only nine unattached aecia are reported for the State, 
though others may occur. In the second place, and apparently much the 
better reason for the inference, of the thirty-four connected-up species 
previously mentioned, only twenty-five have their aecial forms reported 
for the State, while all of the connected-up aecial forms reported for the 
State have their telial forms here also. This latber being very natural to 
suppose for the teliospores are not readily transported by the wind or 
otherwise, and the sporidia, which give the aecial infection, are very 
perishable and entirely incapable of being blown very great distances and 
still remain viable. Hence there seems little if any question but that 
some unattached telial forms come into the State by uredinial infections, 
and are thus kept up through the season and possibly even from season 
to season in some cases. The aecia belonging to such forms may, there- 
fore, be far distant. 
This condition, then, centers our interest in connecting unattached 
forms, largely on the unattached aecia. For of necessity, their respective 
alternate forms must be somewhere in the immediate vicinity of their 
occurrence, except in the few cases where the aecial mycelium is peren- 
nial, in which cases the forms may become somewhat separated. By care- 
fully searching for and finding unattached telial forms, especially near 
where the unattached aecia occur in abundance, clews may often be ob- 
tained that may ultimately lead to proof of the genetic relationship of 
such forms. 
The tables are as follows: 
