FLORA OF THE PALEOZOIC PERIOD. 



33 



pteris Hibernica of Schimper (Plate I. Figs. 1 to 4), along with 

 Sigillaria dichotoma, is very abiiiiclant in beds of the same age 

 in the south of Ireland, from which the specimens described 



Fig. 22. 



by Edward Forbes were obtained. The fructification has re- 

 cently been discovered. This shows that the fern belongs to 



Fig. 22. Marsilea Fahri, a species of Pepperwort or Rhizocarp, 

 with a creeping stem, quadrifoliate stalked leaves on one side, and 

 roots on the other. The fructification, s, is at the base of the leaves, 

 and consists of sporangia, called sporocarps. 



D 



