CHAPTER XVI r. 



UNDERGROUND RHIZOMES AND ROOTS OF PALAEOZOIC 

 LYCOPODIACEOUS PLANTS. 



Stigmaria. 



Stigmaria ficoides is the name given to cylindrical casts met 

 with in Palaeozoic rocks, from the Devonian' to the Permian 2, 

 characterised by a smooth or irregularly wrinkled surface bearing 



Fio. 204. Stigmaria ficoides Brongn. M.S. (See Vol. i. p. 73.) 



spirally disposed circular scars bounded by a raised rim and 

 containing a small central pit. It is not uncommon to find 

 evidence of a partial collapse of the substance of the plant as 



1 Potonie (Ol^). 



2 Goeppert (64) A. 



