[PBNHALLow] N. AMERICAN TAXACE^ AND CONIFERS 35 



DESCEIPTIOX OF FIGUEES. 

 Plate I. 



Fig. l.—Taxus brevifolia. Tangential view of a medullary ray, showing the some- 

 times two-seriate form and the broadly oblong cells, x 210. 



Fig. 2. — Taxus canadensis. Radial view of the spring wood, showing the rather 

 close spirals, x 210. 



Fig. 3. — Taxus canadensis. Tangential view of a medullary ray, showing the nar- 

 rowly oblong cells, x 210. 



Fig. 4. — Torreya taxifolia. Radial view of the spring wood, showing the rather 

 distant spirals, x 210. 



Fig. .5. — Torreya taxifolia. Tangential view of a medullary ray, sliowingthe rather 

 broad, oval cells, x 210. 



Fig. 6. — Libocedrus decurrens. Radial section through the summer wood, show- 

 ing the numerous large pits on the tangential walls, x 210. 



Figs. 7 and S.Lihocedrus decurrens. Radial sections of medullary rays, showing 

 the form of the ray-cells and the structure of the terminal walls, x 210. 



Fig. 9. — Thuya occidentalis. Tangential view of a medullary ray, showing the 

 narrowly oblong cells, x 210. 



Fig. 10.— Thuya gigantea. Radial view of a medullary ray, showing the form of the 

 cells and the simple terminal walls, x 210. 



Fig. 11. — Thuya gigantea. Radial section through the summer wood, showing the 

 nature of the pits on the tangential walls, x 210. 



Fig. 12. — Thuya gigantea. Tangential section of a medullary ray, showing the nar- 

 rowly oblong cells, x 210. 



Fig. 13. — Cupressus Macnahiana. Radial section of a medullary ray, showing the 

 form of the cells and the terminal walls, with local thickenings, x 210 



Fig. 14. — Cupressus macrocarjja. Radial section of the summer wood, showing the 

 large and broadly lenticular pits on the tangential walls, x 210. 



Fig. 15. — Cupressus marrocarpa. Tangential section, showing the broad ray cells. 

 X 210. 



Fig. 16. — Cupressus arizonica. Tangential section of a medullary ray, showing the 

 broad, transversely oval and often resinous cells, x 210. 



Fig. 17. — Junijjerus virginiana. Radial section of a medullary ray, showing the 

 straight cells and terminal walls without pits, x 210. 



Plate II. 



Fig. 1. — JuniperiLS occidentalis. Radial section of a medullary ray, showing the 

 strongly pitted terminal walls, x 210. 



Fig. 2. — Junijjerus occidentalis. Tangential section of a medullary ray, showing 

 the broad and often resinous cells, x 210. 



Fig. 'S.— Sequoia gigantea. Radial section of a medullary ray, showing the charac- 

 ter of the terminal walls and the nature of the pits on the lateral walls. 

 X 210. 



Fig. 4.— Sequoia sempcrvirens. Radial section tlirough the summer wood, showing 

 the nature of the pits on the tangential walls, x 210. 



