FOSSIL FLORA. 701 



Eocene beds ;it Atanekerdluk, (Ti-eeiiland, perliaps approaches most closely. 

 They are, however, larg-er leaves, with coarser, more acute teeth and fewer 

 strictly alternate secondaries. The leaves of F. undnJnta are quite unlike 

 tlie type specimen of F. dentata as described by Gijppert* from the Tertiary 

 of Schossnitz, as indeed are the leaves doubtfully so identified by Heer. 



The Yellowstone National Park leaves are also quite like leaves of 

 F((f/iis castanecefolia Ung., as figured by Heer'- from the same beds. These 

 were afterwards referred, b}- Heer^ to his Castunea unyeri on what seems to 

 me to have been insufticient grounds. There is hardlv any difference 

 between these and leaves of F. uiuhdata, except that the teeth are a little 

 sharper. It is probable that they should be placed together, but as the 

 status of Heer's plants is somewhat unsettled, I have preferred to keep them 

 se[)arated. for the i)resent. 



Cliippert has also described another species, F. affemiatd, from Schoss- 

 nitz, which is really quite close to F. imdidata. It is about the same size and 

 has rounded teeth, but there is uniformly a tooth between two of the teeth 

 which are entered by the secondaries. In F. undidata every tooth is entered 

 by a secondary. 



Fagus aidipofii Abich, as figured by Heer,* from the so-called Miocene of 

 Ala.ska, is not greatly unlike the species under consideration. It has the 

 outline, parallel secondaries, and finer nervation, but not the sau^e kind of 

 teeth. There are a number of other species, as F. atlantica Ung., F. feronm 

 Ung.^ as figured by Lesquex'eux" from ?]lko, Nevada, etc., that resemble 

 F. undulatu in one or more particulars, l)ut not b}' any means sufficiently 

 for specific identity. 



But among all fossil forms, two of the leaves described by Heer as 

 Castuncu loif/eri,'' from the supposed Miocene of Alaska, are undoubtedly 

 nearest to the species under consideration. They are of about the same 

 size and shape, but have teeth a little more acute. The secondaries are 

 numerous, parallel, and enter the teeth as in Fugits uinluhifa, but in origin 



' Tert. FL v. Schossnitz in Schlesieu, Gorlitz, 1855, p. 18, PI. V, fig. 11. 



= Fl. Foss. .\rct.. Vol. I, p. 106, PI. X, tig. la : PI. ZLVI.figs. 1-3. 



^Loc. cit., Vol.11 (Fl. Foss. Alask.), p.32. 



■"Loc. eit., PI. VII, fig. 4. 



H'blor. Prot., PI. XXVII, fig. 2. 



sTert. Fl., p. 14(i, PI. XIX, figs. 1-3. 



' Fl. Foss. Arct., Vol. II ( Fl. Foss. Alask. ), PI. VII, ligs. 1, 2. 



