RELATION OF LEAF STRUCTURE TO PHYSICAL FACTORS 7 1 



ture 50-75 : diphotophyll 125^; chlorenchym (70,;*) 2 loose rows 

 prolate palisade cells 25 /* ; lacunose globose sponge cells. 



Gravel C. no/* P. 3 rows, 90 /* S. 20 /* 



Bog C. 70 M P. 2 rows, 50 M S. 20 /* 



40 M i row, 40 / (44%) o~ 



Light I ; water + 54% ; humidity -f- 20% ; temperature -}- 10. 



Atragene acutiloba 



GRAVEL: light i; available water 2.5-5.5%; humidity 30-65%; 

 temperature 55-76 : diphotophyll 300 /*; epidermis 35/^5 cuticle 

 2/u.; chlorenchym (230^) i row compact prolate and prolobate 

 palisade cells 45 ^ ; compact irregular sponge cells. 



SPRUCE : light 0.03 ; available water 12-16% ; humidity 40-70% ; 

 temperature 48-72 : diphotophyll 300 /*; chlorenchym (230^1) I 

 row prolate and prolobate palisade cells 55 p, ; close irregular sponge 

 cells. 



Gravel C. 230 M P. i row, 45 M S. 185 /t 



Spruce C. 230 /t P. I row, 55 M S. 175 /* 



o +IOM (22%) io/* (5%) 



Light 1/33; water -|- 10% ; humidity -f-(5- IO %>) ; temperature 



-(4-7). 



Apocynum androsaemifolium 



GRAVEL: light i; available water 2.5-5.5%; humidity 30-65%; 

 temperature 55-76 : diphotophyll 175 ft-; epidermis 15 /x, lower 

 surface with papillae ; cuticle 2 ft ; chlorenchym ( 145 /A) i close row 

 prolate palisade cells 85^; close irregular sponge, cells. (Plate 

 VIII, fig. 5 a.) 



THICKET: light 0.016; available water 15-20%; humidity 40- 

 70%; temperature 48-72 : diphotophyll ioo/*; upper epiderimis 

 irregular, lower with reduced papillae; chlorenchym (70/1.) i row 

 funnel palisade cells 30/1; lacunose oblate sponge cells. (Plate 

 VIII, fig. 5 &.) 



Gravel .145/4 P. i row, 85/4 S. 60 M 



Thicket C. 70 /* P. I row, 30 M S. 40 v- 



75 M "^SA* (64%) 20M (33%) 



Light 1/80; water +(12.5-14.5%) ; humidity +(5-10%) ; tem- 

 perature (4-7). 



