1909] BARBER-FRUITS AND SEEDS OF CUCURBIT AC EAR 279 



Embryo— The cotyledons (C) have small epidermal cells on both 

 irfaces and two layers of palisade cells within the inner epidermis. 

 Alcurone grains (al) up to. 6 m, containing globoids and crystalloids, 

 al>o oil. are found in all the cells. 



C. Pepo var. verrucosa Naud. 



This variety, the crook-necked squash, has a rather large flask- 

 shaped fruit, with the neck showing a distinct curve or crook. Longi 

 tudinal grooves occur frequently, but are not so well marked as in C. 

 Pepo. There is a hard rind, yellow or orange in color, covered with 

 very pronounced warts and filled with bundle fibers. The central 

 parenchymatous tissue breaks down only in the swollen base, the 

 neck not expanding enough to tear the tissues apart. 



The seeds, of a dirty white color, are not over 2 cm long, smooth, 

 and flattened, with a border at the edge. 



Pericarp (fig. 7).— The pericarp of this variety differs very 



little from that of C. 

 baldness of the rind. 



1. Epicarp («#).— The palisade layer is about 36/* in height, the 

 thickened, prismatic cells having cuticularized outer and radial walls. 

 The outer wall is not uniformly thickened; instead it has a depression 

 over each cell, giving it a wavy contour in cross-section. 



There are two forms of hairs, resembling those of C. Pepo in size 

 and shape; instead of falling off, however, they persist on the mature 

 fruit - Sunken stomata (sto) are present in considerable number. 



2. Hypoderm (hy).—The cells of this layer resemble those of C. 



Pep 



g in the greater 



P 



ion given for that species applying to this. 



mesocarp 



r v „ v . This characteristic layer consists of many 



,a - v <^ of stone cells which differ considerably in size. The cells are 

 P°ty»onal, small in the sharplv defined outer layer, increasing in size 

 ,n *ard until they are lost in' the next cell layer. About spherical 

 **«■ (*), occurring at the junction of this layer with the hypoderm, 

 l ** cells elongate radially to about twice their transverse diameter. 

 rhe «e cavities are really large intercellular spaces appearing in the 

 **«lg fruit and showing no evidence of secreting cells in any stage ol 

 S^-th. Before the walls thicken the cells bulge out into these 

 Cavitlcs - Among the smaller polvgonal cells are also large spherical 



