TABLE 2 (continued) 



CONCENTRATION OF STOMATA AND LAMINA THICKNESS IN INTIRRIDGE AREAS.* 



Sph . acutitepala 

 Sph. crocea 

 Sph. ki/lipii 



Sph. snidernii 



Sph. woodsonii 



Sph. sp. nov. aff. 

 Sph. woodsonii 



Sph. sp. nov. 



5"/. anomala 



St. stvlaris 



T. hissed us 



No. ofstomata mm : in the 



abaxial epidermis, adaxial 



epidermis, and both 



epidermides 



Ratio of nos. of 

 stomata mm : - 

 abaxiahadaxial 



Lamina thickness - 

 general range and 

 midpoint of range 



(mm) 



236 



164 

 309 



273 

 188 







0.62 



5.6 



10 

 



236 

 164 

 315 

 283 

 188 



ca. oc 



262 

 55 



27 



ca. x 



0.32 0.38; 0.35 



0.29 0.48; 0.39 



0.33 0.38; 0.36 



0.28 0.36; 0.32 



0.36 0.42; 0.39 



123 

 486 

 105 

 176 



227 



3.7 

 1.9 

 

 1.9 



80 



127 

 488 

 105 

 178 

 307 



33 

 260 

 ca. oc 

 94 

 2.8 



0.40 0.45; 0.43 

 0.23 0.32; 0.27 

 0.30-0.41; 0.36** 



0.47-0.61; 0.54 

 0.33-0.43; 0.38 



Lamina thickness - 



in nos. of cell 



lavers 



15-17 

 16-18 

 16-18 

 15-17 

 16-17 



22 



12-14 

 13- 17** 

 18-22 

 17-20 



*Stomatal frequencies were determined by studying mostly stained, but also unstained epidermal peels with the phase microscope at I00X. Stomata 

 were counted on 3.21 mm : of a peel from each of the abaxial and adaxial epidermides. with the following exceptions (the two figures between each 

 pair of parentheses indicate areas studied [mm : ] of the abaxial and adaxial epidermides. respectively): A. peruviana ( 1.81. 1.81 ). A. urophylla(1.0\. 

 3.21). D. harlingii (2.01. 3.21). and D. mirahile (2.01. 1. 61). As often as possible on a peel, fields were studied which were laterally rather than 

 longitudinally adjacent to one another, to maximize randomness of sampling, i.e., to avoid including the same stomata lor interstomatal band(s) in 

 all samples. For certain species the concentration indicated for both epidermides is slightly different from the total of the separate indicated 

 concentrations, because the total was computed and rounded off. prior to rounding off of the separate values. Lamina thickness in mm was 

 determined only for cross sections. Thickness in numbers of cell layers was ascertained, using portions of longitudinal sections containing only 

 epidermal cells and ordinary parenchyma cells. 



**These values were obtained from study of unembedded material which was bleached in an aqueous solution of sodium hypochlorite, and 

 mounted in glycerine. Remaining values were determined during study of stained, plastic-embedded material. 



