XI] 



FORMS OF HAIRS 



87 



may remain unicellular or become divided up into cells 

 by partition walls. 



Fig. 53. d woolly hairs of Gnaphalium i stellate hairs of Draba (K). 



The principal forms of hairs, considered as individual 

 organs, are as follows. The unicellular fine hairs, so 

 common on leaves and herbaceous stems, are described 

 as silky (Salix alba, Laburnum) when bent down and 



