FOSSIL PLANTS OF THE CARBONIFEROUS SYSTEM. 



597 



probable that some of the fronds found in the coal measures have been 

 connected with these stems. Other plants, considered by some authors 



as resembling Marsileacese, have also been found hi certain localities ; 

 such as Sphenophyllum (fig. 796) and Annularia (fig. 797). 



1181. Some fossil plants, allied to Lycopodiums, also occur in the 

 coal measures. These have been included under the genera Lycopo- 



Fig. 793. Sphenopteris Hseninghausii, a fern of the Carboniferous system. 

 Fig. 794. Pecopteris aquilina, another fern. 

 Fig. 795. Neuropteris Loshii, another fern. 



Fig. 796. Sphenophyllum dentatum, one of the dubious forms of the Carboniferous system 

 perhaps allied to Salisburia. 

 Fig. 797. Annularia brevlfolia, a coal plant, the affinities of which are unknown. 



