46 EDITH SCHWARTZ CLEMENTS 



HYDROPHYTA 



Batrachium aquatile 



SUBMERGED: light ; available water 100% ; humidity 100% ; 

 temperature 4O-65 : linear spongophyll, short diameter 300/1, 

 long diameter 540/1; epidermis 15/1; cuticle thin; chlorenchym 

 (270/1,) of compact globose and polygonal cells surrounding two 

 irregular air-passages. (Plate I, fig. 2 a.) 



AMPHIBIOUS (dwarf) : light I ; available water 58% ; humidity 50- 

 70% : diphotophyll short diameter 240 p., long diameter 400 /*. ; 

 chlorenchym (210/1.) I row prolate palisade cells 40/1,; globose 

 sponge cells with one regular layer next to lower epidermis. (Plate 

 I, fig. 2&.) 



Submerged ............... C. 270 ft P. o ft S. 270 ft 



Amphibious .............. C. 210 ft __ P. 40 ft _ S. 170 ft 



6oft + 40 ft loo ft 



Light -f- ; water 42%; humidity (30-50%) '> temperature 

 the same. 



Callitriche bifida 



SUBMERGED: light ; available water 100% ; humidity 100% ; 

 temperature 4O-65 : diphotophyll, lenticular in cross section, 

 100/1 through center, 40/1 at edges; epidermis IS/*.; cuticle thin; 

 chlorenchym (70/01) I row globose cells 15 /i, connected with lower 

 epidermis by groups of similar cells with air-spaces between each 

 group. (Plate I, fig. 30.) 



AMPHIBIOUS (dwarf) : light i ; available water 58% ; humidity 

 50-70%: diphotophyll 150/1; epidermis 12/1; chlorenchym (126/1) 

 i row prolate palisade cells 50/1; compact globose sponge cells. 

 (Plate I, fig. 3&.) 



Submerged ................ C. 70 ft P. o ft S. 70 M 



Amphibious ............... C. 126 ft _ P. 50 ft _ S. 76 ft 



+ 56 ft +50 ft 



Light -f-J water 42%; temperature the same; humidity 

 (30-50%)- 



Hippuris vulgaris 



SUBMERGED: light ; available water 100% ; humidity 100% ; 

 temperature 4O-65 : spongophyll, lenticular in cross section, 

 1 75 /A in center, 40/1 at edges; epidermis io/*; cuticle thin; chlor- 



