208 PLITT AND PESSIN: ON DISTRIBUTION OF LICHENS 
or tremelloides (L.) Gray. 
base of the tree this lichen was very abundant. 
pie one meter above ground practically no trace of it was left. 
Lobaria pulmonaria (L.) Hoftm. 
The distribution of this species is similar to that of Leptogium 
but it was not quite as abundant. 
Parmelia sp. 
This species was practically all over the tree. Although 
so abundant, it was impossible to decide upon the species, for 
everywhere it seemed to be in a juvenile condition. 
Parmelia caperata (L.) Ach. 
One large specimen of this lichen was found on the upper 
third of the trunk on the south side. 
Parmelia conspurcata (Schaer.) Wainio. 
A few patches of this lichen were found on the upper third 
of the trunk. No preference to any particular side was evident. 
Parmelia physodes (L.) Ach. 
Only one patch of this form was found at about seven meters 
from the ground, on the south side of the tree. 
Parmelia rudecta Ach. 
One patch only of this species was found, at about eight 
meters from the ground, on the northeast side of the trunk. 
Parmelia saxatilis (L.) Ach. 
This form had a similar distribution to Parmelia rudecta. 
Parmelsa sulcata Tayl. 
More than fifteen patches of this lichen were found on the 
upper quarter of the tree. 
Parmelia tiliacea (Hoffm.) Ach. 
One specimen of it only was found, near the very top of the 
tree. 
Pertusaria amara (Ach.) Nyl. 
A few specimens of this lichen were found on the north side 
of the tree between one and two meters from the ground. 
Pertusaria multipuncta (Turn.) Nyl. 
This lichen was most abundant on the upper half of the tree. 
No preference for any particular side of the tree was apparent. 
