CERTAIN DICOTYLEDONOUS 
AND CONIFEROUS 
LEAVES, 
259 
| 
Sequoia | Sequoia Sequoia Sequoia Araucarites | 
gigantea. | Couttsieæ. sempervirens. Tournalii. Gôpperti. | 
— | u | 
Poral Axes. | | | 
Vary in direction. | Vary in | Long axis orien- | Long axis | Vary in 
Frequently | direction, | tated vertically ^ vertically direction. 
oblique. | | usually, occa- orientated. Usually oblique. 
| |, sionallyoblique. 
Diameters of Pore. | 
Long axis | 
‘022 mm. 024mm. | ‘037 mm. ‘013 mm. ‘03 mm. 
Short axis | | . 
‘099 mm. | ‘015 mm. | ‘015 mm. ‘005 mm. ‘017 mm. 
— o | 
Cells of the | | 
Poral Ring. | 
All similar. | All similar. | Differentiated | Differentiated | All similar. 
| into two sets. | into two sets, 
Long axis | | Long axis 
‘0309 mm. | ‘027 mm. | :024 mm. 
Short axis | Vertical Cells. Vertical Cells. Short axis 
‘019 mm. ‘008 mm. ‘062 mm. ‘031 mm. ‘012 mm. 
‘017 mm. ‘012 mm. 
| 
' Horizontal Cells, | Horizontal Cells, 
| Long axis ‘032 mm. ‘03 mm. 
| Short axis .... | ‘025 mm. ‘039 mm. 
| | 
Epidermal Cells of | | | 
the Midrib. | | 
Long axis | | | 
‘074 mm, | ‘041 mm. ‘27 mm. | ‘071 mm. | ‘037 mm. 
Short axis | | | 
-014 mm, | ‘012 mm. 024mm. | ‘017 mm. | -013 mm. 
Epidermal Cells. | | 
Between two | | 
stomatal series. | | 
| 
Long axis | | 
| "064 mm. ‘031 mm. 096 mm, 043 mm. | ‘042 mm. 
Short axis | 
‘019 mm, ‘016 mm. "013 mm. ‘014 mm. ‘010 mm. 
Between adjacent | 
stomata of same | 
series. | 
Long axis |, 
‘032 mm, | ‘024 mm. ‘049 mm. 043 mm 025 mm 
Short axis 
‘019 mm. ‘017 mm. ‘028 mm. 014 mm. ‘016 mm. 
