Xl] SPHENOPHYLLUM EMARGINATUM. 407 



II. Types of vegetative branches of Sphenophyllum. 



1. Sphenophyllum emarginatum (Brongniart). Fig. 109. 



1822. Sphenophyllites emarginatus, Brongniart ^ 



1828. Sphenophyllum emarginatum, Brongniart 2. 



1828. Sphenophyllum truncatum, Brongniart^. 



1828. Rotularia marsileaefolia, Bischoff'^. 



1862. Sphenophyllum osnahrugense, Eomer*. 



This species of Sphenophyllum bears verticils of six or eight 

 wedge-shaped leaves varying in breadth and in the extent of 

 dissection of the laminae ; they are truncated distally, and 

 terminate in a margin characterised by blunt or obtusely- 

 rounded teeth, each of which receives a single vein. The 

 larger leaves are usually more or less deeply divided by a median 

 slit. The narrow base of each leaf receives a single vein which 

 branches repeatedly in a dichotomous manner in the substance 



Fig. 109. Sphenophyllum emarginatum (Brongniart). 



From a specimen in the Collection of Mr. R. Kidaton, Upper Coal- 



Measures, liadstock. J nat. size. 

 ' Brongniart (22), p. 234, PI. ii. fig. 8. " Brongniart (28), p. 9^. 



* Bischoff (28), PI. XIII. fig. 1. *• Rttmer, F. (62), y "' ''' ^ •^" '^ 



