RELATION OF LEAF STRUCTURE TO PHYSICAL FACTORS 33 



ADOXA MO'SCHATELLINA : diphotophyll 220/1; epidermis, upper 

 25-50/11, lower 20-30/1; cuticle thin; chlorenchym (150/1) I row 

 subglobose palisade cells 40/1; loose oblate sponge cells. (Plate 

 II, fig. 7.) 



Calypso boreale: tissues close; lower epidermis 40/1; cuticle $ p.; 

 1-2 rows palisade cells. 



MONESES UNIFLORA: diphotophyll 250/1; epidermis, upper 25/4, 

 lower 20/1; chlorenchym (205 /i) 1-2 loose rows globose palisade 

 cells 40/1; lacunose globose and oblong sponge cells. (Plate II, 

 fig. 8.) 



PARIETARIA PENNSILVANICA : diphotophyll 100/1; epidermis, upper 

 25 /i, lower 10/1; cuticle thin; chlorenchym (65/1) I loose row 

 funnel palisade cells 32 /t ; loose irregular to oblong sponge cells. 

 (Plate II, fig. 9.) 



Rosa sayii: palisade cells narrower. 



Geranium richardsonii (sub-type): leaf 150/1; epidermis, upper 

 20 fi, lower 15/1; cuticle thin; chlorenchym (135/1) i loose row 

 funnel palisade cells 55/1; lacunose oblate sponge cells. (Plate 

 VI, fig. 3 .) 



Mertensia pratensis: epidermis, upper 35/1, lower 25/1; palisade 

 cells clustered at lower ends. 



Mertensia ciliata (light o.oi ; available water 25-30%): leaf 

 200 /i ; epidermis wavy, upper 30 /*, lower 20 /i ; palisade cells 

 60 ^ ; clustered at lower ends ; sponge very lacunose. 



Actaea rubra (available water 18%) : palisade cells 30-40/1. 



VIOLA PALUSTRIS: diphotophyll 180/1; epidermis, upper 30/1, 

 lower 20/1; cuticle thin; chlorenchym (130/1) I loose row prolate 

 palisade cells 60 /i ; and I row of subglobose cells 25 /i ; loose oblate 

 sponge cells. (Plate II, fig. 10.) 



Galium aparine (light o.oi) : leaf 150/1; epidermis 20/1; palisade 

 cells 50 /<, ; globose sponge cells. 



Erodium cicutarium (light o.oi) : lower epidermis very unequal, 

 15-50/1; row of cells next to prolate palisade cells globose to prolate 

 25-40 /i. 



Viola blanda (sub-type) : leaf 190/1; epidermis 40/1; cuticle thin; 

 chlorenchym (no/i) i loose row prolate palisade cells 40/1, in- 

 dividual cells frequently divided into two; i row of globose cells; 

 loose globose to oblate sponge cells. 



ARNICA CORDIFOLIA : diphotophyll 350 /i ; epidermis, upper 25 /i, 



