48 



ORGANOGKAPHY. 



the prolongation of its component cells ifig. 112). These 

 scales are particularly abundant on the surface of some plants, to 

 which they communicate a scurfy or silvery appearance, as in 

 the Elseagnus, &c. Such a surface is said to be lepidote, from 

 lepis, the Greek term for a scale. Other modifications of hairs 

 which are allied to the above, are the ramenta or ramenta- 

 ceous hairs so abundant upon Ferns (Jig. 113). These consist 

 of cells (fig. 114) combined so as to form a brownish flattened 

 scale attached by its base to the surface of the epidermis from 

 whence it grows. 



Fig. 112. Fig. 114. 





Fig, 113. Fig. 115. 



F,(l. 112. Scale or radiating hair of the Oleaster (^Fheaoivis). Fig. 113. 



ilamenta from tlic rachis of a Fern Fiff. 114. Komentaceous hair. 



Fi(/. \h^>. Prickles oil Kose-branch. 



When the hairs arc composed of cells which arc short, and 

 liave their sides thickened by secondary deposits so that they form 

 stiffened processes, tiicy arc then called seUe or bristles, and the 

 surlace is termed setose or setaceous. These slightly raodihed, 



