TENOPYR: CONSTANCY OF CELL SHAPE 71 
TABLE VII 
CICHORIUM INTYBUS, COMMON TYPE 
Maximum length and width of each leaf, the width of each leaf across ihe lobes, and 
the constricted portions, and the len eh vate idth of the cells of the lower epidermis in 
these two regions of the leaf. A = width of leaf from midrib lo margin. B = average 
size of cells in mm.. C = average ais of cells to 1 millimeter. Numerals in paren- 
theses show the number of counts. 
| Lobe below this constricted portion 
Vent Size Constricted ni eso 
pera: Near Midrib | Midway out | Apex of lobe 
. from midrib 
Length | Width Length | Width Length | Width | Length| Width | Length | Width 
A 2. | 28. 
250 | 95 B (15) 0.36 | 0.29 | 0.03 | 0.028} 0.33 | 0.03 
© GS) fav.s7 [aa a2 | 34.6 30.11 | 32.48 
A 4 28. 
220 61 B (15) 0.033) 0.027} 0.028) 0.029! 0.03 | 0.029 
C (15) |29.48 | 36.8 (35.65 | 34.28 | 32.09 | 33.8 
A 6. £5) 
135 53 B (15) 0.025|} 0.029) 0.026) 0.027| 0.034) 0.023 
C (15) |38-55 | 34-12 |37-81 | 35-05 | 29.22 | 42.28 
A 5-5 34- 
186 65 B (15) 0.037} 0.027| 0.03 | 0.03 | 0.032) 0.027 
C (15) | 26.43 | 35-85 |33-21 | 32.94 | 31-03 | 35-95 
A 4. 29. 
229 vee B (15) 0.033} 0.028! 0.033} 0.028) 0.029) 0.027| 0.028) 0.026 
C (15) |29.42 | 34-99 |29.35 | 35-47 | 33-5 | 36-1 | 33-56 | 37-45 
A A. 32. 
153 57 B (15) 0.033} 0.029| 0.029| 0.028) 0.034) 0.028) 0.027) 0.029 
€ (15) |30- 34-11 (34-02 | 34.68 | 29.36 |34.6 | 36.52 33-69 
A 4. at: 
I51 55 B (10) 0.034, 0.025| 0.03 | 0.032} 0.026) 0.026 
C (10) |29.24 | 39.46 |32.92 | 30.41 | 37-21 | 37-07 
: Av. A 4.5 26. 
Av. 189|/Av.65|Av. B(100)| 0.033) 0.028) 0.029) 0.020) 0.031 0.027 
v. C(100)| 30.14 | 35-92 |33-7 | 34-23 | 31-62 | 35-99 
Ratio dimensions of cell...... 5 ee Sy a Orc t TisttT 
The lower epidermal cells of the eee ones of each leaf 
4 - 
were compared with those of the i ly adjacent 
toit. The ratio of the average length to the average width of the 
cells is .o4 greater in the constricted portion than in the middle. 
region of the lobe, and .16 greater than in the lobe near the midrib. 
This rather slight difference is apparently due to the fact that the 
