HARRIS: DESERT LORANTHACEAE 311 
Phoradendron Coryae Trel., on Quercus 
Dr. Trelease notes that certain of these numbers belong in his 
form stenophylla, but it has not seemed worth while for present 
purposes to separate these from the more typical P. Coryae. 
As far as known this species occurs exclusively on Quercus. 
The leaves of these desert oaks are so hard that at the mid-summer 
season when these determinations were made it was impossible 
to express sufficient sap from them to make freezing-point deter- 
minations. 
On Quercus oblongifolia Torr. 
Coll. 282, Mistletoe 1, A = 2.23, Р -"26.7 
Mistletoe 2, А = 2.09, P = 25.1 
Coll. 283, Mistletoe т, A = 2.01, Р = 24.2 
Mistletoe 2, A = 1.88, P = 22.6 
All four determinations were made on samples collected July 
IO on two trees in the Basin, Santa Catalina Mountains. 
Coll. 292, on Quercus Emoryi Torr. A — 2.15, P — 25.9 
The Basin, Santa Catalina Mountains, July 11. 
Coll. 528, on Quercus hypoleuca Engelm. August Io. 
A = 1.73, Р = 20.8 
Coll. 570, August 19. А =226 Р жар 
Both of these collections were taken from a very large Phora- 
dendron on a small oak, growing among the boulders on the edge 
of Sabino Creek, in the Basin, Santa Catalina Mountains. The 
first determination seemed suspiciously low, and the second sample 
was taken from the same individual plant on the тов to check 
the results. 
Coll. 355, on Quercus arizonica Sarg. July 19. 
A = 2.63, P = 31.5 
Near Mud Springs, Santa Catalina Mountains. 
Coll. 356, on same species July 20. A = 2.43, P = 20.1 
On Mount Lemmon trail, between the Basin and Mud Springs. 
Phoradendron macrophyllum (Engelm.) Cockerell 
on Fraxinus attenuata Jones 
For the host and parasite I am able to give determinations 
made in the early spring of 1914 and in the summer of 1916. 
The results secured on the desert mistletoe in the early spring of 
. 
