58 EDITH SCHWARTZ CLEMENTS 



70% : diphotophyll 200 //. ; second row of palisade lacunose and oblo- 

 bate; loose oblate sponge cells. 



Light ij; water -{-(44-49%); humidity +(5-20%); tempera- 

 ture the same. 



ALPINE ROCK-CLEFT: light 0.05; available water 12-17%; hu- 

 midity 40-60%; temperature 4O-6~5 : diphotophyll 200 p.; upper 

 epidermis 20 p with longer cells; chlorenchym (165^) first row of 

 palisade 60 p, second row 40/11, reduced or lacking; loose irregular 

 sponge cells. (Plate VI, fig. 5 &.) 



Aspens C. 220 ft P. 2 rows, 125 n S. 95 ft 



Rock-cleft . . . C. 165 ft P. 2 rows, 100 ft S. 65 ft 



55M 25/* (20%) 30ft (31%) 



Light 1/17; water +3%; humidity (0-10%) ; temperature 

 10. 



SUBALPINE THICKET : light o.oi ; available water 19% ; humidity 

 40-70% ; temperature 48-72 : diphotophyll 125 p; epidermal cells 

 elongated; cuticle thin; chlorenchym (IOO/A) I loose row funnel 

 palisade cells 35 /*, and a row of globose cells, the remains of the 

 second row of palisade 25 /u, ; loose oblate sponge cells. ( Plate VI, 

 fig- 5 c.) 



Aspens C. 220 ft P. 2 rows, 125 ft S. 95 ft 



Thicket C. iQOft P. 2 rows, 60 ft S. 65 ft 



120ft 6s/t (52%) 30ft (31%) 



Light 1/80; water +(5-10%) ; humidity +(5-10%) ; tempera- 

 ture ( 2 -3). 



ALPINE SPRUCE THICKET (seedling): light 0.0028; available 

 water 12-16% ; humidity 40-60% ; temperature 3O-55 : diphoto- 

 phyll 75 fj.; epidermis io/*; cuticle thin; chlorenchym (55/0 2 loose 

 rows funnel palisade cells (20^1) second row looser; a row or so of 

 tiny globose and oblate sponge cells. (Plate VI, fig. 5 d.) 



Aspens C. 220 ft P. 2 rows, 125 ft S. 95 ft 



Spruce C. 55 fJ- P. 2 rows, 40 M S. 15** 



165*1 85/1 (68%) 80 /* (84%) 



Light 1/300; water +( 2 ~3%) 5 humidity (0-10%) ; tempera- 

 ture 20. 



Mertensia polyphylla 

 SUNNY BROOK BANK: light i ; available water 15-25% ; humidity 



