110 The Lower Cretaceous Floras of the World 



Protorhipis Roemeri Schenk 



Ruffordia Ocepperti (Dunker) Seward 



Sagenopteris Mantelli (Dunker) Seward 



Sphcnopteris delicatissima Schenk 



Sphenopteris Fittoni Seward 



cf. Tceniopteris, Sewaxd = Nilsonia (?) 



WeicTiselia reticulata (Stokes and Webb) Ward 



The Belgium flora is of a very fragmentary character, but apparently 

 includes one or more vague algal remains, 15 or 16 varieties of ferns, 

 1 lycopod, 1 equisetum, only 1 cycad, and 10 conifers. 



Germany 



The serious study of the flora of the German Wealden may be said 

 to have begun with Bunker's oft-quoted monograph, which appeared in 

 1846. In the German area (northwest Germany, Hanover, and the Hol- 

 land frontier) the Hastings sand of England is represented by the 

 Diester (Hils) sandstone, while the upper or argillaceous member is 

 called the Weald clay (Walderthon). The term Wealden has sometimes 

 been amplified to include the underlying Purbeck, as is the case in Kay- 

 ser's well-known text-book. Other writers consider the German Wealden 

 older than that of England,^ a view certainly not supported by the flora. 



The most important contributor to our knowledge of the German 

 Wealden flora is Schenk,^ although Ettingshausen and others have made 

 minor contributions. A partially revised list of the recorded species in- 

 cludes the following: 



AMetites Linkii (Roemer) Dunker 

 Alethopteris cycadina Schenk 

 Alethopteris Huttoni (Dunker) 

 Anomozamites Schaumburgense (Dunker) 

 Baiera pluripartita Schimper 

 Cladophlebis Browniana (Dunker) Seward 

 Cladophlebis Ungeri (Dunker) Ward 

 Clathraria Lyelli Stokes and Webb 



^ Pavlow and Lamplugh, Argiles de Speeton et leurs equivalents. Moscou, 

 1892. 



^ Schenk, Die Flora der nordwestdeutschen Wealdenformation, Palaeonto- 

 graphica, Band xix, 1871, pp. 203-276, pi. xxii-xliii; Band xxiii, 1876, pp. 157- 

 163, pi. XXV, xxvi. 



