576 IOWA ACADEMY OF SCIENCE 



TUMION CALIFOBNICUM Greene. California Nutmeg. 

 Leaves flat, 1 inch to 3^ inches long, edges tend down. 



Resin duct one, large, central, on ventral side, not touching epi- 

 dermis, lined by several irregular concentric layers of cells. 



Vascular bundle one, not enclosed in a definite bundle sheath. 



Hypodermal cells not present. Epidermis deep, very thick 

 walled and lignified, lower epidermis decidely mammillated. 



Stomata borne in deep narrow grooves on ventral side of leaf, 

 one groove each side of midrib. Stomata flanked by long 

 forked suberized pillars. 



Palisade parenchyma very deep, composed of long narrow cells. 



Material from University of California. 



Plate LXVI. 



Figure 1. — Section of leaf of Tumion californicum. 



Figure 2'. — Section through upper epidermis of leaf of T. 

 californicum. 



Figure 2". — Section through lower epidermis of leaf of T. 



calif or n't i ma. 



Figure 2'". — Section through a ventral groove on leaf of T. 

 californicum, showing stomata and pillar-like cells. 



Figure 4. — Section through vascular cylinder and resin duct 

 of leaf of T. californicum. 



