I06 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



EXPLANATION OF PLATE XIV. 



All figures were drawn with an Abbe camera lucida. 



Fig. I. Cross-section of green redwood leaf, showing position of vascular 

 bundle and resin-tubes, the well developed palisade parenchyma 

 and scierenchyma. X 30. Diagrammatic. 



Fig. 2. Cross-section of a larger white redwood leaf, showing the absence 

 of palisade parenchyma and scierenchyma. X 30. Dia- 

 grammatic. 



Fig. 3. Strip of epidermis from upper side of green redwood leaf, showing 

 distribution of stomata near midrib. X 60. 



Fig. 4. Similar strip from white redwood leaf, showing distribution of 

 stomata in an equal area. X 60. 



Figures 3 and 4 are from mountain redwoods. 



Fig. 5. Similar strip from green redwood leaf, showing number and dis- 

 tribution of stomata. X 60. 

 Fig. 6. Similar strip from white redwood leaf, showing the same. X 60. 



Figure 5 is from redwood growing in Arboretum of Stanford 

 University, fig. 6 from mountain redwood. 



Fig. 7. Part of green leaf shown in fig. i, from above vascular bundle, 

 showing palisade parenchyma, scierenchyma, starch-grains, and 

 other contents of palisade cells. X 300. 



Fig. 8. Part of figure cut off" by dotted line, showing starch-grains and 

 other contents of mesophyll cells, thick-walled scierenchyma and 

 epidermis at edge of leaf, strengthening cells around resin-tube, 

 etc. X 300. 



Fig. 9. Corresponding part of fig. 2, a white redwood leaf, showing unor- 

 ganized contents of mesophyll cells, lighter strengthening tis- 

 sues, etc. X 300. 



Fig. 10. Showing structure of stoma of white redwood and absence of 

 chlorophyll and starch-grains. X 300. 



Figs. II and 12. Two views from the surface of stoma from white redwood 

 leaf; fig. 11 from above, showing auxiliary q^Ws ( Nebenzellen); 

 fig. 12 from further down, showing guard cells. Stoma closed. 



X 350- 



Fig. 13. Surface view of epidermis and stoma from green redwood leaf, 

 showing larger and more vigorous epidermal cells, and decidedly 

 thicker walls of epidermal cells. X 350. 



