58 



The Pericycle is one cell in thickness, forms a 

 sheath, round the phloem, and stores up 

 starch. 



The Endodermis, which in Ferns and the higher 

 plants consists of a continuous ring of cells, is 

 here represented by a large air-space, tra- 

 versed by bridges of tissue called Traheculce. 



Leaves. Small — sessile — thin. 



Epidermis. Cuticularised, and contains chloro- 



phyll. 

 Stomata. Middle of under surface. 

 Mesophyll. Not differentiated. 

 Bundle. One — same structure as stem bundle. 



Root. General structure same as stem except 

 that the skin being absorptive, is known as the 

 pilifery, instead of epidermis. Branching mostly 

 exogenous — segments cut o:ff by the apical cell form 

 the lateral roots. 



Root Growth. An apical cell. Free upper sur- 

 face cuts off the cap cells. The other segments cut 

 off as in the stem. 



EEPEODUCTION. 



The male and female reproductive organs are 

 produced on fertile branches. The fertile leaves 

 form a quadrangular spike, the leaves are uniform 

 in size and usually somewhat of a different form 

 from the barren ones. 



