606 



FOSSIL PLANTS OF THE SECONDARY STRATA. 



There are 5 fossil ones according to authors. The fossil Cycadaceae 

 known up to 1845, and distinguished by specific names, amount, 



according to Goeppert, to 78. Amongst these are 9 stems or stipes, 

 65 fronds, and 4 fructifications. The genera are: 



78 9 65 4 



To this some add Mantellia and Palaeozamia. The greater number of 

 these is found in the Oolite and Lias. In the inferior oolites are 

 also seen peculiar Coniferae, belonging to the genus Brachyphyllum (fig. 

 819), and a plant said to be a true Equisetum (fig. 820). The fossil 

 Flora of the Wealden formation resembles in many respects that of 

 the Oolitic system. Fronds of ferns, leaves of Coniferae (Sphenophyllum) 

 and of Cycadaceae, occur along with some Fucoids. There are also 

 silicified coniferous trunks, and two peculiar genera called Clathraria 

 and Endogenites. The former is an arborescent plant, having its bark 



Fig. 817. Cycas revoluta, one of the species of Cycas of the present flora of the globe, with its 

 scale-like stem and pinnate fronds. 

 Fig. 818. Zamia pungens, one of the Cycadacea at present existing on the globe. 



