,098 DR. M. T. MASTERS! GENERAL VIEW 
jects into the mesophyll in the form of wedge-shaped masses. The 
cells of the mesophyll have infolded walls, and the resin-canals are 
median and surrounded by stereome-cells. The endoderm con- 
sists of from 45-50 cells, thick-walled externally. The meristele 
is oblong or subtriangular in section, with a branched fibro- 
vascular bundle and a band of stereome-cells between the 
subdivisions. The male flowers are each surrounded by 10-15 
spirally imbricated scales (Engelmann). 
The cotyledons vary in number from 12-18. 
36. Pinus Tarpa, Linneus; Sargent, Silva, xi. (1897) p. 111; 
Britton & Brown, i. p. 53, fig. 
A species of which an authentic specimen may be seen in the 
herbarium of Linneus. It is widely distributed from New 
Jersey to the Gulf States and Texas. The buds are oblong- 
conic, the male flowers cylindric, curved, arranged in corymbose 
clusters. The cones are about 12 cent. long, sessile, spreading, 
oblong-conic; apophysis tumid, dark brown, with a small deflexed 
subulate mucro. 
The leaf-section is three-sided with uniform hypoderm ; the 
cells of the mesophyll have projecting walls, and the median resiv- 
canals are surrounded by stereome-cells. The endoderm-cells 
are about 50in number. The meristele is triangular, and the 
fibro-vascular bundle branched, with the branches either separate 
or sometimes approximate. 
The cotyledons are 5-8. 
37. P. Trocotr, Chamisso et Schlechtendal, ex Parlatore, in 
DC. Prod. xvi.’ p. 396. 
A Mexican species, of which little or nothing is known beyond 
what has been published in the text-books. The cones are 
stalked or subsessile, deflexed, elongate, cylindric-conic, slightly 
curved ; the apophysis rather tumid, with a small central deltoid 
umbo. 
38. P. patua, Schiede § Deppe; Parlatore, in DC. Prod. xvi." 
p- 397; Masters, in Gard, Chron. Jan. 24, 1885, fig. 20. 
The young shoots of this Mexican species are olive-brown 
covered with a glaucous bloom or, in some cases, slightly 
hirtellous. The buds are cylindric-conic, sharply pointed. The 
leaves are three-sided, with the dorsal side convex, the lateral 
ones Concave, all stomatiferous. The section is triangular with an 
