XI] SPHENOPHYLLUM EMARGINATUM. 407 



II. Types of vegetative branches of Sphenophyllum. 



I. Sphenophyllum emarginatum (Brpngniart). Fig. 109. 



1822. Sphenophyllites emarginatus, Brongniart', 



1828. Sphenophyllum ema/rginatum, Brongniart^. 



1828. Sphenophyllum trimcatum, Brongniart^. 



1828. Rotularia marsileaefolia, Bisohofi'^. 



1862. Sphenophyllum osnabrugense, Romer''. 



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 dichotomons manner in the substance 



Fig. 109. Sphenophyllum emarginatum (Brongniart). 



From a specimen im the Collection of Mr. B. Kidston, Upper Coal- 

 Measures, Eadstook. f nat. size. 

 1 Brongniart (22), p. 234, PI. ii. fig. 8. = Brongniart (28), p. 68. 



" Bischoff (28), PI. xiii. fig. 1. " Eomer, F. (62), p. 21, PI. v. fig. 2. 



