FLOEA. OF THE SECONDARY PERIOD. 



745 



Asterophyllites, and Ooniferas. The genera of Ferns here met with 

 are also found in the Car- 

 boniferous epoch ; the 

 Crymnosperms are chiefly 

 species of WalcHa (figs. 

 923, 924) and Nogger- 

 athia (the latter is sup- 

 posed by Sohimper to be a 

 Oycad) ; Lepidodendron 

 elongatum, Oalainites gi- 

 gas, and Annularia ilori- 

 bunda, are also species of 

 this period. Goeppert has 

 given an account of the 

 plants of the Permian 

 formation. Among other 

 plants he enumerates the 

 following : — Equisetites 

 contractus, Calamites Suc- 

 kowi, C. leioderma, Astero- 

 phyllites equisetiformis, A. elatior, Huttonia truncata, H. equiseti- 

 formis, many species of Psaronius one of the filicoid plants, Hymeno- 

 phyllites complanatus, Sphenopteris crassinervia, Sagenopteris tEBuise- 

 folia, Neuropteris imbricata, and many other species of these genera ; 

 several species of Odontopteris, Callipteris, Cyclopteris, Dioonopteris, 

 Cyatheites, Alethopteris, Noggerathia, Cordaites, Anthodiopsis, Dicty- 

 othalamus, Calamodendron, Arthropitys / besides species of Sigillaria, 

 Stigmaria, and Lepidodendron. Various fruits are also mentioned, 

 under the names of Rhabdocarpus, Cardiocarpus, Acanthocarpus, 

 Trigonocarpus, and Lepidostrobus. 



Fig. 923. 



Fig. 924. 



II. -FLORA OF THE SECONDARY OR MESOZOIC 

 PERIOD. 



Beongniaet's Reign op Gymnosperms. 



In the Carboniferous period the Aorogenous Cryptogams were 

 found to predominate, while the Gymnospermous Dicotyledons were 

 less numerous. In this reign, on the other hand, the Acrogens are 

 less numerous, and the Gymnosperms almost equal them in number, 

 and ordinarily surpass them in frequency. 



Figs. 923, 924. Walchia piniformis Stemb., a common species in the Permian rocks of 

 Europe. Fig. 923. Plant with leaves and frnctifloation. Fig. 924. Fruotiflcation, 

 natural size. 



