332 BOTANICAL GAZETTE [NOVEMBER 
running both in the horizontal and vertical planes point strongly 
toward the Abietineae. The species is new and has been named 
Sequoia Penhallowti. It appears to be more closely allied to the 
living S. gigantea, and has, moreover, the same geographical occur- 
rence. A formal diagnosis is given in the body of the article. 
In conclusion I wish to express my obligations to Professor R. T. 
JAcKsON for permission to investigate the material described in this — 
article, and to Professor D. P. PENHALLOw for the opportunity af 
examining his type slides of fossil Sequoias. 
HARVARD UNIVERSITY. 
EXPLANATION OF PLATES XVIII AND XIX. 
PLATE XVIII. 
Fic. 1. Transverse section, including several annual rings and showing 
both horizontal and vertical resin canals in Sequoia Penhallowit. X 39. 
Fic. 2. Transverse section of thin growth rings of same species. X 180. 
Fic. 3. Tangential section of the same showing horizontal resin ducts. * 8. 
Fic. 4. Transverse section through a healed wound in the wood of the same 
species; on the right is a horizontal traumatic resin duct; smaller traumatic ducts 
can be seen in the spring wood of the three annual rings abutting on the wound. 
x 4. 2 
Fic. 5. Part of another section through the same wound, showing three 
horizontal ducts on the left . the smaller vertical ducts of the spring wood can be 
more clearly seen on account of the greater magnification. X 8. 
Fic. 6. The central region of still another section through 
showing small vertical ducts in the spring wood. X 8 
PLATE XIX. ae 
Fic. 7. Another of the same more highly magnified from the margin 
wound. xX 16. i 
Fic. 8. Transverse section through one of the large horizontal ducts see 
fig. 3. X 40. : 
Fic. 9. Section through a smaller duct from the same preparation - 
illustrated in the last figure. X 60. j 
Fic. 10. Section dieing the relation between a horizontal and a vertical 
duct; the former is blocked by a tylosis. x 50. : 
Fic. rr. Longitudinal etc showing the scanty resiniferous te 
on the face of the summer wood in two annual rings; a vertical resin a 
shown. X 60. a 
Fig. 12. Radial section to show the topography of a medullary i s 
size: on the horders of the ray can be seen the empty crystallogenous 
