os “ _ parenchyma of the leaf rather than to the epidermis | ~ 
‘the under-side of the leaf of Polypodium vulgare ; ee epidermal cells ; sf stoma ;_ me 
~ p parenchyma of the leaf; ¢ air-cavity. (x 400.) x ea 4 
itself. The stomata are sometimes found at the bottom of Ae a 
ae) -funnel-shaped depression, sometimes on a level with — 
the epidermal cells ; while sometimes (Fig. 86) they usu 
eth, and are in addition, aa des fron then by” 
~ containing chlorophyll. This last circumstance gave rise to. ss 
- the earlier view that these cells belong to the subjacent: ge aa 
. 
x 
‘ 
a 
: 
a 
- A 
’ 
4 
xs 
a 
a 
Fic. 86.—I. Transverse section through the epidermis of the leaf of Cycas revoluta; — 
. # elevation of the epidermis ; I]. Transverse section through the epidermis of 
even elevated to a higher level. They establish a con.» 4 
