[NOVEMBER 
328 BOTANICAL GAZETTE 
from the living species of Sequoia is the very abundant pitting of the 
tangential walls of the medullary ray cells. This is an additional 
point of resemblance to the Abietineae. Through the kindness of 
Professor PENHALLOW’'I have had the opportunity of examining the 
type specimens of his Sequoia Langsdorfii and Sequoia Burgessil. 
The state of preservation of the medullary rays is very indifferent in 
these species; but so far as could be made out they do not possess 
the peculiar marginal cells and the strong pitting of the terminal 
(tangential) walls which are characteristic of our species. The Sequoia 
magnifica of KNOWLTON has badly preserved medullary rays, accor: 
ing to the author’s description.? Professor PENHALLOW has seen 
sections of our species and agrees that it is new and unlike any which 
have been described. The name Sequoia Penhallowii is proposed 
for it in recognition of Professor PENHALLOW’S great services » 
the paleobotany of the Coniferales. The following is the diagnosis: 
Sequoia Penhallowii, n. sp. : 
Transverse.—Rings of growth rather narrow, with sharply marked - ser 
summer wood. Rings’ regular, or if varying in thickness varying uniformly 
and without violent transitions except as the result of injury. Resin canals 
present in both the vertical and horizontal planes apparently only as the ae 
of injury. The resin canals when present surrounded by resin cells, cage 
dark brown resin. Resin cells inconspicuous and confined to the face of 
summer wood, except in the case of injury, where they may be present ner 
the zone of annual growth. Tracheids of the spring wood ey large wee 
pits on the radial walls only. Tracheids of the summer wood with tangential i 
adial—Rays without tracheidal cells, but with distinctly differen : 
marginal cells. Lateral pits of ray cells elliptical and bordered, larger 2 MS's" 
cells. Rows of pits single in the central cells of the ray and two to ae ‘i 
in the marginal cells. Medullary ray cells covering one to f pire! oor 
central ones resiniferous, the marginal generally empty, sometians 
large clinorhombic crystals inclosed in cysts derived from the cell ee of ‘ 
cells with undulating free border, deeper than central cells. End 
cells of the medullary rays very strongly pitted. Loge wr ase of inj 
also pitted and rather thick. Rays contain resin canals a the wood. Res® 
which take their origin from similar vertical canals running gee re external 
‘ ¢ Ms Hi times m i 
canals of the rays sometimes ending blindly and some al rings, varying 
series of vertical canals, often extending through may 4g penerallf 
greatly in size and frequently occluded by tyloses. ping 
with two rows of opposite pits, which often alternate in the ends. 
7 Op. cit. 
