VIIl] 



MARCHANTITES. 



235 



and in this case we have the additional evidence of the charac- 

 teristic male receptacles which are given off from a point 

 towards the apex of the lobes, and arise from a slight median 





B 



Fig. 50. Marchantites Sezannensis Sap. A. Surface Tiew of the thallus ; 

 g, ?oups with gemmae. B. A male branch. C. A portion of A 

 magnified to show the surface features. (After Saporta.) 



depression. In one of Saporta's figures (reproduced in fig. 50 A) 

 there are represented some median scars which may mark the 

 position of cups similar to those which occur on recent species 

 of Marchantia, and in which gemmae or bulbils are produced. 



The collection of Sezanne fossils in the Sorbonne includes 

 some very beautiful casts of Marchantites in which the 

 structural details are preserved much more perfectly than in 

 the examples described by Saporta. In a few specimens which 

 Prof Munier-Chalmas recently showed me the reproductive . 

 branches were exceedingly well shown. The fossils occur as 

 moulds in the travertine, and the museum specimens are in the 

 form of plaster-casts taken from the natural moulds. 



Several species of Liverworts belonging to the Marchantiales 

 and Jungermanniales have been recorded from the amber of 

 North Germany, of Oligocene age. These appear to be repre- 

 sented by small fragments, such as are figured by Goppert and 



