Pr 
OF THE GENUS PINUS. 6OL 
are attached to it. On the same branch of a specimen labelled by 
Engelmann some of the leaves are 12-14 inches long, others only 
5 inches in length. Comparative study in its native locality can 
alone suffice to determine the limitations and characteristics of this 
species. Iu the variety Lindleyana I tind a layer of thin-walled 
water-cells beneath the epiderm; cells of the mesophyll with 
infolded walls, median resin-canals surrounded by a stereome- 
sheath. The endoderm-layer consists of 25-30 oblong cells. The 
meristele is oblong in section, with a branched vascular bundle. 
The male inflorescence is capitate. 
It may be noted that in most, if not all, the cones examined 
by me under various names the upper border of the apophysis 
is lancet-shaped and acute at the extreme tip. 
44. Pinus riniroxia, Lindley (1840); Parlatore, in DC. Prod. 
xvi.” p. 400. 
A species collected by Hartweg in Guatemala, concerning 
which little is known beyond what is published in the works 
above cited. The leaves are in fives, very long and slender 
(22-30 cent. long). In section they are triangular, with thick 
hypoderm projecting inwards in wedge-shaped masses. The 
cells of the mesophyll have infoided walls. ‘I'he resin-canals are 
median and surrounded by a sheath of stereome-cells. The endo- 
derm consists of 30-40 large oblong cells.. The meristele is 
triangular in section, with the two branches coherent in a single 
fibro-vascular bundle (see Pl. 21. fig. 6). 
The cones are pendulous, 21-22 cent. long, conic, slightly 
curved, the apophyses rhomboid with a prominent umbo. Seed 
speckled, much shorter than the obliquely oblong wing. 
I have specimens from Tolueca, Nelson 5!, and from Capt. 
Donnell-Smith, 2662! 
45. P. neropnynua, Schiede § Deppe; Parlatore, in DC. Prod. 
XV. p. 401. 
A Mexican species extending into Guatemala, with leaves in 
tufts of five, slender, three-sided, triangular in section, the dorsum 
convex, sides concave, mecting anteriorly in a prominent ridge. 
The hypoderm forms a single layer, the cells of the mesophyll are 
not sinuous, the resin-canals are median surrounded by stereome- 
cells. The endoderm consists of 18-20 large ovoid cells thickened 
on the outer side. The meristele is triangular in section, and 
the fibro-vascular bundle divided. he male flowers are race- 
