CARBONIFEROUS. 



1 1 1 



areas are in contact, the spiral pattern is more 

 marked than in SigiUaria. The roots of these 



regu- 

 larly at each subdi- 

 same 

 structure d in 



the brancho which 

 Q the trunk. 

 - formerly 



ted 

 an 



pitted pattern 

 to which l< 

 S 



are 



like clubs, at the 

 ds of the brand.- 



lits were 

 termed 1 

 bus. lli 

 Lye 



Iron in - 



the lc 



fhe titernal structui 



itral 

 nit; mdedby woody ^hich is formed 



of , the cam- 



bium la rmed ° f lar ? e sphencal 



cells seen in the quill- 



to this is the bark, formed of 



which are elongated. 



f the la al which are richest 



in I rbons, such as the better bed-coal, are 



formed of spores of such plants. These spores 



bond of the fern 

 the Indwe 



