76 



MORPHOLOGY OF TISSUES. 



Fig. 65.— Transverse section through the hofizontal thallus of Marchantia j>olymo}-pha ; A central part, furnished on 

 the under side with the leaf-hke appendages h, and the root-hairs h (Xso) ; B marginal part of the thallus, more highly 

 magnified ; / colourless, reticulately thickened parenchyma ; o epidermis of the upper side ; chl the cells containing 

 chlorophyll ; sp stomata ; j partition-walls between the broad intercellular spaces ; u lower epidermis with its cell- 

 walls coloured dark. 



Fig. 66.— Sap-conducting intercellular passages in the young stem of ivy, in transverse section (XSoo) \ A,B,C show 

 young passages at g, placed at the boundary of the cambium c and the soft bast wb ; h the wood ; D and E, at g, larger 

 and older passages, lying at the boundary of the bast b and the cortical parenchyma (?■/). 



