THE HOP PLANT. 23 



which is mounted on a short peduncle, begins to darken in 

 colour. The fruit is a small nut, and, even when ripe, is 

 closely surrounded by the perigonium, the outer pericardium 

 of which carries at the base a few tufts of hair, and is pro- 

 vided with cup-shaped glandular scales, the lupulin granules, 

 to which further reference will be made later on. 



In the case of the cultivated hop, fructification being as 

 far as possible suppressed, germinating seeds are seldom met 

 with, though present in large quantity on wild hops. On 

 the other hand, certain small grains formed by the enlarge- 



PiG. 12.— Clubbed glands. FiG. 13.— Disc gland, 



(a) Incipient. (6) Developed. 1 : 200. 



ment of the ovaries on barren flowers are not uncommon in 

 cultivated hops. 



The normal fruit is about i inch long'by -^2 inch broad, 

 and is brown or dark in colour. Each fruit contains a single 

 seed consisting of a spiral germ enclosed in an endosperm, 

 a cuticular layer, and an epidermis. 



The most important components of the flower are the 

 lupulin glands. These, as well as the other glands of the 

 hairs and epidermis, have been thoroughly investigated by 

 Bauter, Lermer, and Holzner.^ 



^ Zeitschrift fUr das gesammte Bramoesen, 1893, Vol. XVI., No. 12. 



