80 THE LATER EXTINCT FLORAS OF NORTH AMERICA. 



Order ULMACE^E. 



Ulmus speciosa Newb. 



PI. XLV, figs. 2-5, 7, 8. 



Proc. U. S. Nat. Mtis., Vol. V (March 21, 1883), p. 507. 



Ulmus pseudo- Americana Lesq., Cret. and Tert. Fl. (1883), p. 249, PI. LIV, fig. 10. 



"Leaves 4 to 6 inches in length by 2 inches in width, petioled, long- 

 ovoid, or elliptical in outline, pointed at summit; margins coarsely and 

 doubly serrate; nervation strong, regular, fifteen, to twenty parallel 

 branches one either side of midrib. Fruit large, 27 centimeters in diam- 

 eter, subcircular, emarginate." 



This large and fine species of elm is represented by hundreds of 

 specimens in the collection made by Rev. Thomas Condon, and while 

 most are imperfectly preserved, there are some which show all the details 

 of form and structure. The general aspect of the leaves is not unlike 

 that of TJ. Bronnii Ung. (Chlor. Prot, p. 100, PI. XXVI, figs. 1-3), but is 

 fully twice as large and coarsely and doubly serrate. 



The leaf represented by fig. 8 is one of many which occur in the 

 collection, all presenting nearly the same character; that is, they are 

 smaller than those just described, with much finer marginal dentation. 

 That dentation is, however, double and like that of the larger leaves, 

 though less pronounced, and there are no characters presented by these 

 leaves which would justify us in regarding them as representing a distinct 

 species. For the present, therefore, it has been thought better to leave 

 these as small forms of TJ. speciosa. 



Among living species TJ. fulva approaches closer to those now under 

 consideration than any other, and the differences between the fossil and 

 living forms are not so great but that we may very well regard one as the 

 progenitor of the other. In TJ. fulva the leaves are smaller and relatively 

 broader, being ovoid in outline, but the character of the marginal dentation 

 and of the nervation is essentially the same. 



The samara, represented by fig. 7, is supposed to be the fruit of the 

 large elm described above. It is very similar in size and character to the 

 fruit credited to TJ. Bronnii by Ung., but is somewhat broader. It has not 

 yet been distinctly connected with the leaves we have called TJ. speciosa, 



