[sifton] bar of SANIO IN GYMNOSPERMS 99 



DESCRIPTION OF PLATES 



Plate I 



Fig. 1. — Zamia integrifolia, petiole; scalariform pitting on primary wood. 

 X340. 



Fig. 2.—Cycas revoluta, petiole; transitional pitting on primary wood. X340. 



Fig. 3. — Cycas revoluta, petiole; tangential of primary wood showing bars and 

 rims of Sanio. X340. 



Fig. 4. — Araucaria Bidwilli, radial of ovulate cone; secondary wood showing 

 bars of Sanio. X340. 



Fig. 5. — Dioon spinulosum, radial of stem; secondary wood showing bars of 

 Sanio. X340. 



Plate II 



Fig. Q.— Dioon spinulosum, radial of stem; secondary wood showing bars and 

 rims of Sanio and elimination pitting. X185. 



Fig. 7. — Chamaecyparis oblusa {Retinospora lycopodioides) , radial of root; 

 showing enlarged pitting, both primordial and secondary, and bars of Sanio whose 

 horizontal fusion is incomplete. X340. 



Fig. 8. — Thuja occidentalis , radial of root; some bars of Sanio incompletely 

 fused. X340. 



Fig. 9. — Thuja occidentalis, radial of stem; pitting mostly uniseriate and bars 

 of Sanio with complete horizontal fusion. X340. 



Plate III. 



Fig. 10. — Taxodium distichum, radial of root; less elimination of pitting; some 

 bars of Sanio with constrictions indicating their compound origin. X254. 



Fig. 11. — Abies amabalis, radial of stem; Abietinean rims and bars of Sanio. 

 X185. 



Fig. 12. — Pinus strobus, radial of root close to primary wood; rims of Sanio of 

 primitive type. X340. 



Fig. 13. — Pinus resinosa, axis of ovulate cone, close to primary wood; 

 primitive type of rims of Sanio. X340. 



Fig. 14. — Taxodium distichum, radial of stem. X254. 



Plate IV 

 -Torreya nucifera, radial of root. X340. 



-Gnetum scandens, radial of stem, through primary wood. X340. 

 -Gnetum scandens, stem; radial wall of vessel. X340. 

 -Ephedra gerardiana, radial of stem. X340. 

 -Taxus cuspidata, radial of stem. X340. 



Plate V 

 -Ginkgo biloba, radial of stem, near the pith. X432. 

 -Ginkgo biloba, radial of short shoot. X432. 

 -Ginkgo biloba, radial of stem. X432. 

 -Ginkgo biloba, radial of root. X432. 

 -Goinkg biloba, radial of stem. X432. 

 -Ginkgo biloba, radial of stem, near pith. X432, 

 -Ginkgo biloba, radial of stem. X432. 

 -Ginkgo biloba, radial of stem. X432. 



