U2 



N. E. Stevens — Petrified Palms. 



P. remotuut its vascular bundles are scattered, rather 

 rounded in outline, and the fundamental tissue contains 

 thick walled cells (dark colored in the fossil material). 

 These thick walled cells of the fundamental tissue differ 

 markedly from the similarly placed "dark cells" distin- 

 guished by Stenzel (3, p. 197) in P. porosum and P. remo- 

 timi in that they usually occur in groups, have larger cell 

 cavities, and are variable in size and shape. The stone 

 cells thus constitute a good diagnostic character of the 

 species {^g. 16.) 



The present species of silicified palm wood can appro- 

 priately be named only after its finder. Dr. George L. 

 Cannon, who has done so much to advance the knowledge 

 of both the fossils and the geologv of the Denver resfion. 



Fig. 16. — P. cannoni, stone cells showing their varying size and -svall 

 thickness. One cell shows pits in the lower wall. X 80. 



Description of Species. 

 Palmoxylon cannoni^ sp. nov. 



Locality — Lower portion of the Denver formation (Eocene) western 

 suburbs of Denver, Colorado. 



Type (portion of specimen and the type sections) in 

 Yale museum. 



Fibrovascular bundles scattered, usually about 10 per 

 sq. cm., .8 to 1. mm. in diameter. Bast region rounded 

 in outline, flattened where it joins the vascular portion. 

 No marked difference in size, shape or arrangement of 

 fibrovascular bundles in different parts of the specimen. 

 No auxiliary sclerenchyma bundles. Fundamental tissue 

 composed of irregular, rather thin walled cells, with large 

 intercellular spaces, and also beset by groups of thicker 

 walled ^^ stone" cells varying greatly in size, thickness 

 of wall, and number of cells to the group. Stone cell 

 groups usually measure from .1 to .3 mm. in diameter. 



