278 PTERIDOPHYTA. [<-«■ 



There is another species of Equisetites, E. Munsteri, Schk., 

 from a lower geological horizon which has been compared with 



B 



Fig. 64. Equisetites lateralis Phill. A. Part of a stem showing leaf-sheaths 

 and an imperfect diaphragm. B. A single flattened leaf-sheath. C. A 

 detached nodal diaphragm. From a specimen in the York Museum. 

 Slightly reduced. 



E. lateralis, and lends support to the view that the so-called 

 branch-scars are nodal diaphragms'. This species also affords 

 additional evidence in favour of retaining the generic name 

 Equisetites for Phillips' species. Equisetites Munsteri is a typical 

 Rhaetic plant ; it has been found at Beyreuth and Kuhnbach, 

 as well as in Switzerland, Hungary and elsewhere. A specimen 

 of Equisetites originally described by Buckman as E. Brodii^, 

 from the Lower Lias of Worcestershire, may possibly be iden- 

 tical with E. Munsteri. The leaf-sheaths of this E,haetic species 

 consist of broad segments prolonged into acuminate teeth ; some 



' Since this was written I have found a specimen of Equisetites lateralis in 

 the Woodwardian Museum, in which a diaphragm like that in fig. 64, C, occurs 

 in the centre of a flattened leaf-sheath similar to that of fig. 64, B. 



^ Buckman (50) p. 414. 



