410 



MEMOIRS OF THE NEW YORK BOTAJflCAL GARDEN 



basilar, spreading; margin apparently sparingly and coarsely 

 toothed, apparently developed below into a basilar appendage 

 or alate border to the petiole. 



These leaves, which are abundantly represented in the collec- 

 tion, are snrficially indistinguishable from those of the existing 

 sycamore, Platanus occidentalis Linnaeus, of the Eastern United 

 States. They are larger than the average-sized leaves on mature 

 trees, but many individual leaves might be selected that would 

 equal or exceed our specimens in size. The original specimens 

 upon which the generic determination was based, are repre- 

 sented by the two figures, on plates 41 and 42, respectively. 



Specimens that have been referred to P. occidentalis may be 

 found described in a number of different papers that are con- 

 cerned with Pleistocene deposits in various parts of North 

 America. The species, or forms closely allied to it, appear to 

 have been as abundantly represented and as characteristic of 

 the Pleistocene flora as were species of Fagus identical with or 

 closely allied to F. grandifolia, and the several species of 

 Hicoria. A number of specimens, from Pleistocene deposits in 

 Alabama and North Carolina, were described and figured by 

 Berry and si^ecimens that are apparently specifically identical 

 with the latter, from the Pleistocene (Sunderland formation) of 

 Maryland, were figured and referred by the writer^^ to Platanus 

 aceroides Goeppert. All of these, however, are much smaller in 

 size than are those from the Saint Eugene silts, but otherwise 

 they are closely similar. 



Platanus aceroides Goeppert," as originally described and 

 figured, was based upon specimens from the Miocene of Silesia ; 

 but subsequently a considerable diversity of forms, from both 

 the New World and the Old, and ranging in age from the Eocene 

 to the Miocene, and possibly Pliocene, were referred to the spe- 



31 Berry, E. W. (a) Pleistocene plants from Alabama. Amer. Naturalist, vol. 

 41, p. 696, pi. 2, fig. 5. Nov. 1907. (b) Pleistocene plants from North Carolina. 

 U. S. Geol. Survey, Prof. Paper 140-C, p. 112, pi. 55, figs. 1-9. 1926. 



32 Hollick, Arthur. Md. Geol. Survey, Pliocene and Pleistocene, p. 231, pis. 73, 

 74. 1906. 



33 Goeppert, H. E. Die Tertiare Flora von Schossiiitz in Schlesien, p. 21, pi. 9, 

 figs. 1-3. 1855. 



