274 



BO TA XICA L GA ZE T TE 



[apih 



rounded shape. The hairs dry up and disappear while the fruit is 

 still very small, leaving the foot-cell intact. Later the epidermal cells 

 divide, thicken their walls, and press against the foot, which thus be- 

 comes polygonal. As both kinds of cells are of the same size, the 

 two are indistinguishable, which accounts for the absence of hair 

 scars on the mature fruit. 



The first form of hair is jointed (t l ) and of great size, often reach- 



ing a length of 1.5-2 



mm 



The diameter increases rapidly (up i 



about 85 v) for a short distance from the foot, then gradually tapers, 

 forming a long, thick-walled (5/*), conical hair. The first few cells 



Fig. 2. — CucurbUa Pepo L. Epicarp in surface view. X320. 



are two or three times as broad as long, while the following cell- 

 become elongated as the hair increases in size. 

 _ The second form is capitate (t 2 ), and like the first increas" « 

 diameter from the foot, forming a jointed stalk of four or live «&. 

 It ends with a large spherical head of one or more cells, often $4*° 



diamet 



Hypoderm 



— Many cell layers of exceed 



cells, 20 p in diameter, form this layer. The cells have thick wall 

 occasional pits, and small intercellular spaces. The visible contc-n 

 consist of numerous protein granules. This layer closely resemb I 



Pep 



•P 



o- ~„„c, mnocarp.— within the preceding layer is » •**- 

 Posed of cells graduating in size from the small cells of the hyp* 



region com* 



lerm 





