NOTES ON THE MONTEREY PINE. 
GEORGE J: PEER CE; 
(WITH FIVE FIGURES) 
In the spring of 1898 the entomologists of Stanford University 
discovered a fly, Diplosis pint-radiate Snow,’ which produced a 
leaf-gall or at least a basal hypertrophy of the leaves (needles) 
of the Monterey pine (Pinus radiata D. Don.) Some of the 
botanical features of this insect attack were described in 1900 
by Cannon.” Certain other features, as well as notes on other 
matters connected with this tree, I wish to add to what Cannon 
said 
As its name implies, the Monterey pine is a coast tree, 
“very restricted in its distribution: Pescadero, southwest of 
Monterey and Pacific Grove.’”3 It is commonly planted, how- 
ever, over a rather extended territory, though with a success 
which is evidently proportioned to two things: the rainfall and 
the humidity of the air in summer. It seems to thrive about 
San Francisco and on the ocean side of the peninsula which 
separates the southern half of San Francisco Bay from the sea, 
but it needs moister, cooler air in summer than it gets in this 
part of the Santa Clara Valley, although careful watering will 
keep it in fair condition even here. Along with the coast 
redwood (Seguoia sempervirens Endl.) this tree is subject to a 
great variety of enemies, in addition to being exposed in culti- 
vation to unfavorable climatic conditions. In the arboretum of 
the university the unfavorable factors in the environment are 
most evident. To mention only conspicuous enemies of the pine, 
one finds Arceuthobium occidentale,s a Peridermium, certain fungi 
causing spots on the leaves,scale-insects, bark-borers,and the gall- 
tSnow, W. A., and MILLs, Miss H., in Entomological News 11 :—. 1900. 
2Cannon, W. A., The gall of ‘the Monterey pine. Amer. Nat, 34: 801-810. 
1900. 
3JEPSON, W. L., Flora of western middle California. I9o01. 
41 purpose publishing later a study of this phanerogamic parasite. 
448 [JUNE 
