TRANSVERSE SECTION OF OAK-BARK. 



cfc, cork. phel, phellogen. col, collenchyma of the phelloderm. 



cr, crystals. pc, pericycle fibres. c&, cambium. 



p, periderm. (N.B. the bracket p should extend more to the right so as 

 to include the phelloderm, col.) c, cortex. 



phli to phl, the phloems of four years, the youngest being next the 

 cambium ; the outer part of each phloem consists of a layer of bast- 

 fibre/; thick- walled pitted sclerenchyma cells are to be seen near p: 

 medullary rays run outwards from the cambium. 



