THE CARBONIFEROUS FLORA. 149 



The following are North American species : 

 Trunks. 



Dadoxylon Ouangondianum, Dn . .M. Erian Report, 1871.* 



D.Halli, Dn " 



D. Newberryi, Dn " " 



D. Clarkii, Dn. (Cordaeoxylon f) . . . " Report, 1882. 



D. Acadianum, Dn Coal - formation Acadian Geol- 



and millstone ogy. 



grit. 



D. Materiarum, Dn Do. and Permo- 66 



Carb. 



D. (Palaeoxylon) antiquius, Dn . . .L. Carboniferous. " 



D. annulatum, Dn Coal-formation. " 



Ormoxylon Erianum, Dn Erian Report, 1871. 



Foliage. 



Araucarites gracilis, Dn N. Coal-formation " 



and Permian. 



Walchia robusta, Dn ... Permian. \ ^^°j^ ce ° Ed 



W. imbricatula, Dn " ) , T . , 



^ ward Island. 



All of the above can be vouched for as good species based upon 

 microscopic examination of a very large number of trunks from dif- 

 ferent parts of North America. The three Erian species of Dadoxylon 

 and D. antiquius from the Lower Carboniferous have two or more 

 rows of cells in the medullary rays. The last named has several 

 rows, and is a true Palmoxylon allied to D. Withami of Great 

 Britain. D. materiarium is specially characteristic of the upper 

 coal-formation and Permian, and to it must belong one or both of 

 the species of foliage indicated above. D. Clarkii has very short, 

 simple medullary rays of only a few cells superimposed, and has an 

 inner cylinder of scalariform vessels, approaching in these points to 

 Cordaites. Ormoxylon has a very peculiar articulated pith and 

 simple medullary rays. 



Witham in 1833 described several Carboniferous species of pine- 

 wood, under the generic name Pinites, separating under the name 

 Pitus species which appeared to have the discs on the cell-walls 



* " Geological Survey of Canada : Fossil Plants of Erian and Upper 

 Silurian Formations," by J. W. Dawson. 



