194 M. Brongniart on the different Floras which 



Flora of the Gr^s bigarre of 

 the vosges. 



Acrogenous Cryptogams. 



Ferns. 



Neuropteris grandifolia, Schimp. 



imbricata, Schimp. 



Voltzii, Brong. 



intermedia, Schimp. 



elegans, Brong. 



Trichomanites myriopliyllum, Brong. 

 Pecopteris Sultziana, Brong. 

 Anomopteris Mougeotii, Brong. 

 Crematopteris typica, Schimp. 

 Protopteris Mougeotii, Brong. 



Lesangeana, Schimp. 



mieropeltis, Schimp. 



■ Voltzii, Schimp. 



Caulopteris? tessellata, Schimp. 



EaUISETACE^. 



Equisetites Brongniartii, Schimp. 

 Calamites ? arenaceus, Jag. 

 Mougeotii, Brong. 



Gymnospenuous Dicotyledons. 

 ASTEROPHYLLITE^ ? 



Schizoneura paradoxa, Schimp. 

 jEthophyllum speciosum, Schimp. 

 stipulare, Brong. 



CoNIFERiE. 



Voltzia heterophylla, Schimp. 



acutifoUa, Brong. 



Haidingeria latifolia, Endl. 



elliptica, Endl. 



Braunii, Endl. 



speciosa, Endl. 



Cycadace^. 



Zamites vosgesiacus, Schimp. 

 Ctenis Hogardi, Brong. (Nilsonia 

 Hogardi, Schimp.) 



Doubtful Monocotyledons. 



Yuccites vosgesiacus, Schimp. 

 Palaeoxyris regularis, Brong. 

 Echinostachys oblonga, Brong. 

 cylindrica, Schimp. 



I have not cited any locality for these plants of the^^re* bigarre, 

 because they are all derived from the quarries worked on the two 

 slopes of the Vosges, but particularly from that of Sultz-les-Bains, 

 near Strasburg. Anomopteris Mougeotii, however, has been found 

 in some localities in Baden. It is remarkable that these beds of 

 fossil plants are thus limited to this region. But in comparing 

 this flora with that of the slate quarries of Lodeve, which have 

 been regarded as of the same epoch, it will be seen that the two 

 lists have nothing in common, and that it is by no means pro- 

 bable that these formations were contemporary. 



4. Jurassic Period. 



This period is one of the most extensive in regard to the for- 

 mations it comprises and the variety of diiFerent special epochs 

 of vegetation embraced in it, even though we are obliged to com- 

 prehend, under a common title, epochs during which frequently 

 very analogous forms have succeeded to one another. It would 

 comprise, thus, from the Keuper inclusively to the Wealden forma- 

 tions. In fact, the Pterophyllum of the Keuper reappears, with 

 slight specific modifications, in the Wealden formations. The 

 Equisetites of the Keuper extend as far as the middle oolitic for- 

 mation ; the Baierce of the lias also reappear in the Wealden sti-ata 

 of the north of Germany ; the genera Sagenopteris and Campto- 

 j)teris are found equally in the Keuper, the lias and the oolite. 



Nevertheless these common characters, which indicate a great 

 analogy between the floras of each of these epochs of formation, 



