FOSSIL FLORA. (3(39 



the. type, and the nerves may not fork. It is possible that it is a new 

 species, but until better material can be obtained I have preferred to retain 

 the specimens under this sjDecies. 



Habitat: Yellowstone River, one-half mile below mouth of Elk Creek; 

 collected by F. H. Knowlton, August 13, 1888 (fig. 6). Yellowstone River, 

 wall of canyon above mouth of Hellroaring Creek; collected by W. H 

 Weed, October 13, 1887. 



ASPLENIUM REMOTIDENS 11. Sp. 

 PL LXXX, fig. 7. 



Pinnae large, coriaceous, broadly lanceolate, taper pointed, obtuse 

 and unequal sided at base; margin with few remote sharp teeth; midvein 

 strong; lateral veins at an angle of about 45°, simple or forking once some 

 distance above the midvein; sori not seen. 



The very perfect example figured is the only specimen obtained. It 

 is 11 cm. in length and 2.5 cm. broad. It is broadly lanceolate with a 

 slender tapering apex and obtuse unequal-sided base. The nervation is 

 very obscure. It is probable that all of the lateral veins fork, but it was 

 not possible to make this out, and the figure shows many as unforked. 

 The ones that are made out to have the fork show it some distance above 

 their base. 



This species is very closely allied to, if not indeed identical with, 

 Asplenium erosum (Lx.) Kn., 1 from the Denver formation of Colorado. It 

 has exactly the same shape, but differs in having few remote teeth, and in the 

 branching of the veins. In A. erosum the veins fork at the base and occa- 

 sionally above the middle. In any case the species are very close together 

 and may be combined at any time if future material from the Yellowstone 

 National Park shows variation in the characters now relied upon for their 

 separation. 



Habitat: Yellowstone River, one-half mile below mouth of Elk Greek 

 at base of bluff; collected by F. H. Knowlton, August, 1888. 



Dryopteris weedii n. sp. 

 PI. LXXX, fig. S; PL LXXXI, fig. 2. 

 Frond twice pinnate; pinnae probably lanceolate in outline; pinnules 



Under Pteris erosa Ex., Tert. PI., p. 53, PI. IV, fig. 8; Cret. and Tert. PI., p. 121, PI. XIX, fig. 1. 



