58 
This species, for which a few of the many records are cited above, was 
described by Heer in 1874 from the Kome beds (Lower Cretaceous) of 
Greenland, and he subsequently identified it from the Atane beds (Upper 
Cretaceous) of the same region. Dawson reported it from a number of 
localities referred to the Kootenay, but these records are questionable and 
probably represent the fern genus Onychiopsis. Fontaine and Ward 
subsequently reported it from the Lower Cretaceous of the Black Hills, and 
Lesquereux and Newberry had recorded it from the Dakota and Raritan 
formations. It is also present in the Tuscaloosa formation and the Cheyenne 
sandstone. 
The question whether all of the records represent a single botanical 
species has never been settled and seems doubtful. In fact it may be 
pointed out that the generic reference to Asplenium has only slight basis, 
the earlier forms suggesting, as mentioned above, the genus Onychiopsis, 
and the later forms suggesting the genus Anemia. Asplenium dicksonianum 
is very similar and perhaps identical with another fern of uncertain generic 
relations described as Dicksonia groenlandica Heer and occurring in the 
Upper Cretaceous of Greenland, and in the Raritan formation of New 
Jersey and the Tuscaloosa formation of Alabama. 
It is present in a fragmentary condition at the following Upper Blair- 
more localities: CS3, CS4, CH9, and DA6. 
Genus, cladophlebis Brongniart 
Pteris albertsii Heer, Flora Fossilis Arctica, vol. 6, ab. 2, p. 29, PI. 16, figs. 
5, 6; PL 28, figs. 1-3; PI. 46, figs. 22-24 (not Cladophlebis alberisvi of 
European students). 
Several very poorly preserved fragments from the Upper Blairmore 
appear to be identical with this form described by Heer from the Atane 
beds of western Greenland. Heer considered it to be the same as a species 
described by Dunker from the European Wealden, but this does not seem 
to be the case. The latter is not uncommon in the Wealden of Europe, 
but is known from the western hemisphere in only the older Potomac of 
the Atlantic Coastal Plain 1 . 
Aside from the great difference in age, there are minor features sug- 
gesting that the earlier and later occurrences represent distinct species, but 
the question can be definitely settled only by the collection of more 
abundant and better preserved material. 
The Upper Blairmore occurrences are localities CSS and DA6. 
Cladophlebis sp. 
An undeterminable species of Cladophlebis is represented in the 
collection from locality CS3. 
1 For an account of this species See Berry, E. W.: Lower Cretaceous; Md. Geol. Surv., p. 252, PI. 32, figs. 3, 4 
(1911). 
