298 



THE PLANT COVERING OF OCRACOKE ISLAND. 



1 wide layer beneath the mid vein, the latter separated from the lep- 

 toine by several layers of colorless parenchyma. 

 Stereome, none. 



CMorenchyma: Palisade a single layer of short cells, very compact; 



pneumatic tissue occupying the 

 rest of the leafs thickness, also 

 rather compact. 



Physalis viscosa L. 



Leaf flat, thin, imperfectly bifa- 

 cial, gray-canescent or green (de- 

 pending upon the amount of 

 pubescence). 1 



Epidermis similar on both faces, 

 cell walls not thick, the radial un- 

 dulate ; cuticle above and beneath 

 the veins thick and warty; stomata 

 much more numerous on the dorsal 

 surface; hairs (fig. 45) about 

 equally numerous on both faces, 



FIG. O—Phusalia iiinoooo-braiiched hair from tllin-walled With granular cuticle 

 leaf. Scale 240. . ,. „ ' 



consisting of a unicellular stalk 

 bearing 3 or 4 (usually 3) conical, acute, unicellular or sometimes 

 bicellular arms, these in turn sometimes once-branched. 



Hypodermdl collencliymatic tissue above and beneath the veins. 



Sfereome, none. 



CMorenchyma: Palisade and pneumatic tissue not well differen- 

 tiated, both compact. 



1 The individuals observed upon Ocracoke Island had greener, less pubescent 

 leaves than at Cape Henry, Va. 



