EPIDERMAL APPENDAGES — HAIRS. 



31 



branched (fig. 82) ; at other times they are composed of many cells 

 either placed end to end, as in monHifonn or necklace-like hairs (fig. 

 83), or united together laterally, and gradually forming a cone, as in 



compound hairs (fig. 84), or branched (fig. 85). When several hairs 

 proceed from a common centre, they become stellate (stella, a star), 

 or radiated (fig. 86). The latter arrangement occurs in hairs of the 

 Mallow tribe, and is well seen in those of Deutzia scabra, and on the 

 stem of the Rice-paper plant (Fatsia papyrifera). When stellate hairs 

 are placed closely together, so as to form a sort of membranous ex- 

 pansion (fig. 87), a scale or scurf is produced. In Bromeliacese the 

 scurfiness of the leaves is a marked character. To such expansions of 

 the epidermis the name l^is (Xsot's, a scale) is applied, and the 

 surface is said to be lepidote. These scales have sometimes a beau- 



Fig. s*. 



Fig. 83. 



Fig. 86. 



tiful silvery appearance, as in Elseagnns and Searbuckthom (fig. 87). 

 Surrounding the base of the leaves of Ferns, a brown chaffy substance 



Figs. 80-86. Forms of hairs, e. Epidermis. 80. Simple hair formed of a single, undi- 

 Tided, elongated, and tapering cell. 81. Forked or bifurcate haiis of Sisymhrium Sophia, 

 formed by one cell of the epidermis, e, dividing into two. 82. Branched hair of Arabis 

 alpina, formed by a simple hair of the epidermis, ~e, dividing into nmnerons conical cellular 

 blanches. 83. Moniliform hair, from Lychnis chalcedonica. Fig. 84. Partitioned, 



nnbranched hair, from stem of Bryonia alba. Fig. 85. Partitioned, branched hair, from 

 flower of Nicandis anomala. Fig. 86. Stellate or star-like hair, from leaf of Althsea 

 rosea. 



