FOSSIL FLORA. 787 



also makes their determination certain. Several other species, havino- a 

 wider distribution, are very abundant in these beds, such as Aralia notata, 

 which is represented by more than 100 specimens, and Sequoia langsdorfii, 

 which has a wide distribution, but is most abundant in this country in 

 the Fort Union beds. Sequoia coutfsice, having a somewhat wide i-ano-e, is 

 also very abundant in the beds under consideration and the Fort Union. 

 Besides these are a number of species that can not be mistaken, as Zizi)]^)hi!i 

 serrulatus, Taxites oJrih't, etc. 



One species, Aspleniuin erosum, has been found in both Laramie and 

 Denver strata in C'olorado. It is represented by only 2 or 3 small and 

 more or less doubtful examples from the Yellowstone below Elk Creek. 

 JiujJans nujosa is a species of wide distribution and therefore of compara- 

 tively little value stratigraphically. It is found from the Laramie to the 

 Miocene, but is rare in the acid beds within the Park. Quercus olafseiii has 

 been found in the Laramie, but its determination in the Park depends on a 

 single doubtful fragment from the \ncinity of Elk Creek. 



The species that have also been found in the Green River beds are 

 comparatively unimportant. Lijuodium kaulfusii is, in this country, a typical 

 Green River species. It is rare in the acid series, but abundant in the basic 

 series along the Lamar River. Musophyllum complicatuiii has never before 

 been reported outside of the Green River Ijeds. Ficus ungeri and TUia 

 popuVifolia are typical Green River plants, but are represented here by one 

 or two exaanples each. 



The species found in the Auriferous gravels are the only ones remainino- 

 to be considered. Of the 1 1 species, Juf/hms rugosa, Quercus hreiveri, Salix 

 lavateri, and Quercus olafseni are ojien to doubt, as they are represented by 

 only one or two fragments each. Ficus asinnni(pfolia likewise depends upon 

 a single leaf, but it is a well-preserved one, and the determination is probably 

 correct. Aralia notata, another of the species, is very rare, if really found 

 at all, in the Auriferous gravels. The three remaining species are rela- 

 tively abundant, and there is little question as to the correctness of their 

 determination. 



The species whose distribution lies beyond the limits of the Park 

 having been i)assed in review, it will be of interest to note the obvious 

 affinities of certain of the more important new forms. Thus, Aspleiiiuiii 

 remotidens is closely related to A. erosum, inn\. Drgopteris iveedii and D. xaittho- 



