1909I 



BARBER-FRUITS AND SEEDS OF CUCURBIT AC EAE 



291 



pidermi 



A layer of small parenchyma cells makes up 



thh 



w 



Perisperm {fig. 18, N) 

 ig. 18, C) have the same s 

 salivus. 



(fig 



CUCUMIS ERINACEUS L. 



(fig 



is 6-8 mm long, 2-3 



mm 



broad, and 1-1.5™ thick, flattened, pointed, smooth, and yellow. 



(fig 



This is quite similar 



to that of C. Melo. 



The prismatic cells 



are 



Fig. 20. — Cucumis 

 trinaceus L. 

 Xi. 



— . radially elongated to 70* increasing ; in lei^h 

 Seed " but slightly if at all over the edge. Each radial 



rod broadened at the base and 



wall has one 



bluntly pointed at the outer end. 



ubepidermal 



edge 



"umi, langentiaiiy elongated ceiib, iutica 3 xxi . 



of the seed. They are thick-walled, pitted, striated, and increase 



sae from without inward. Occa- 

 sional small intercellular spaces are 

 seen, especially at the edge. 



(scl) . 



This 



3. Sclerenchyma v _„ / . 

 ngle-celled layer, 40 n in width, 

 differs from the subepidermal layer 

 principally in the greater size of 

 the cells, which are longitudinally 

 elongated and ha\ 



■e very 



thick 



muous walls containing pits. 



la 



y ..._ 0).— The outer 

 *yer is made up of very small cell 

 *ith thin walls and small pits seen 

 only with very high magnification. 

 In the middle layers the cells are 

 somewhat larger, also thin-walled, 

 *ith intercellular spaces at the angles 

 of the cells. 



Seed in cross, secuon ^J ^.^ 



C °T ^ Vub subepidermal layer 

 ?; Snchvma ^layer, f, gj 



t^k P^ g ^°e^ 

 jrrains. X160. 



