206 



LYCOPODIALES 



[CH. 



to the occurrence of stumps of vertical trunks which pass down- 

 wards into regularly forked and spreading arms. These arms 

 lie almost horizontally in the sand or mud like the underground 



Fio. 199. Partially decorticated stem of SiiiiUaria showing two zones of cone- 

 scars. From a cast in the Sedgwick Museum, Cambridge. M.S. 

 (I nat. size.) 



rhizomes of PJiragmites and other recent plants growing in 

 swampy situations where water is abundant and where deeper 



