580 DR. M. T. MASTERS: GENERAL VIEW 
ticated specimen is to be found in Linneus’s herbarium, there is 
little that need be added. 
In the seedlings examined by me the caulicle or, as it is now 
generally called, the hypocotyl, is remarkable for tapering upwards. 
How far this is characteristic remains to be seen. The herbaceous 
shoots are slender, greenish, covered with fine white sete, and 
destitute of leaves at the base. The leaves have two rows of 
stomata on the sides, but none on the back, they are triangular 
in section, with the cells of the mesophyll sinuous. The marginal 
resin-canals are surrounded by a sheath of stereome-cells. The 
meristele is circular in section, and the fibro-vascular bundle 
unbranched. The endoderm consists of about 20 cells. 
The leaves of this species are softer and less rigid than those 
of Pinus monticola, which represents it on the Pacific side of the 
American continent, and they are stouter and not so long as in 
the Himalayan excelsa, to which it is also nearly allied. 
The scales of the cone are scoop-like at the tips, more so than 
‘ in either P. monticola or P. excelsa, and the lowermost cone- 
scales are often more or less recurved. 
The cotyledons vary in number from 7 to 14. 
In the Natural History Museum (British Museum) is a speci- 
men from N. California collected by Lemmon and named monticola. 
The size and shape of the cone are indeed those of monticola, 
but the tips of the scales are rounded and recurved, resembling 
in this particular the P. strobiformis of Sargent from Arizona 
(see ante, p. 578). 
8. Pinus monricota, D. Don; Sargent, Silva, xi. (1897) 
p. 23, tabb. 540, 541. 
In the herbaceous shoots of this species, whitish, capitate, 
glandular hairs are intermingled with the whitish or brownish 
sete which beset the brownish surface. 
Engelmann describes the resin-canals as peripheral and not 
encircled by strengthening cells, but in some of the wild specimens 
examined by me I have seen stereome-cells surrounding the 
canals. 
The leaves are triangular in section, with a circular meristele 
separated from the cortex by an endoderm-layer of 25-28 cells. 
The fibro-vascular bundle is unbranched. There are three rows 
of stomata on the sides of the leaf. The cone-scales are flatter 
and less scoop-like than in P. Strobus. Cotyledons 6-9. 
