352 



M, Brongniart on the different Floras which 



Pinites macrocephalus, Brong. * — 



England. (Zamia macrocephala, 



L.^H.) 

 sussexiensis, Brong. — Engl. 



(Zamia sussexiensis, Mant.) 

 Cunninghamites oxycedrus, Sternb. 



— N. Schona. 



elegans, Corda. — Bohemia. 



planifolius, Corda. — Bohemia. 



Dammarites albens, Gopp. — Boh. 



crassipes, Gopp. — Silesia. 



Araucarites acutifolius, Corda. — 



Bohemia. 



crassifolius, Corda. — Bohemia. 



Eleoxylon cretaceum, Brong. — Boh. 



(Pinus eretacea, Corda.) 



Angiospenuous Dicotyledons. 

 Myrice^e. 



Comptonites? antiquus, Nilss. — Sca- 

 nia. 



BETULACEiE. 



Alnites ? Friesii, Nilss. — Scania. 



CUPULIFER^. 



Carpinites arenaceus, Gopp. — Siles. 



SALICINEiE. 



SaUcites? Wahlbergii, Nilss. — Sca- 

 nia. 



Petzeldianus, Gopp. — Silesia. 



fragiliformis, Zenk. — Blankenb. 



AcERINEiE. 



Acerites cretaceus, Nilss. — Scania. 



JUGLANDE^. 



Juglandites elegans, Gopp. — Silesia. 

 Dicotyledons of uncertain Family, 



Credneria integerrima, Zenk. 



denticulata, Zenk. — Blankenb. 



biloba, Zenk. — Blankenb. 



— • — subtriloba, Zenk. — Blankenb. 

 Sternbergii,jBrow^. — Teschen; 



Bohemia. 



cuneifolia, Bro»^. — N. Schona. 



expansa, Brong. — N. Schona. 



tremulaefolia, Brong. — Nieder- 



schona. 



Besides these should be noticed at least ten or twelve species 

 of undetermined and often imperfect dicotyledonous leaves, 

 figured by Geinitz, Reuss, Corda and Goppert, or existing in 

 collections. 



This flora, which now comprises about sixty or seventy known 

 species, is, as is seen, remarkable from the gymnospermous 

 Dicotyledons almost equaling the angiospermous, and for the 

 existence of still a rather large number of well -characterized 

 Cycadese, which cease to show themselves at the eocene epoch of 

 the tertiary formations. 



The genus Credneria, comprehending dicotyledonous leaves 

 with a very peculiar nervation, but the affinities of which are 

 doubtful, is also one of the characteristic forms of this epoch, in 

 a tolerably large number of localities. With regard to the spe- 

 cies of dicotyledonous leaves referred to determinate families, I 

 must remark that these determinations, founded on very imper- 

 fect specimens, few in number, are still very uncertain, and can- 

 not furnish a basis for any comparison with other floras, or any 

 certain conclusion. 



* A specimen of this fruit, which has just been communicated to me by 

 Mr. Wetherell, establishes in a very positive manner that it is not the fruit 

 of a Zamia, but the cone of a Pinus, having all the characters of this genus, 

 relatively to the form and direction of the scales and the position of the 

 geminate seeds at their bases. As to Z. sussexiensis, its analogy with the 

 preceding seems to mc evident. 



