FLORA OF THE GREEN RIVER GROUP. 137 



LYCOPODIACE^. 



LYCOPODIUM, Linn. 

 Lycopodium prominens, Lesqx. 



"U. S. Geol. Rep.," vii, p. 45, pi. v, figs. 13-136. 



FILICES. 



SPHENOPTERIS, PMll. 



Sphenopteris Guyottii, sp. nov. 



Plate XXI, Figs. 1-7. 



UltiiDSite pinna} linear-lanceolate, of various lengths; racliis narrow and narrowly 

 winged by tlie decurreut base of the lanceolate obtuse pinnules ; lower pinnules regu- 

 larly divided into 2 to 4 half-round short lobes, connate in the middle; upper pinnules 

 entire, oblong, obtuse; medial nerve thin, pinnately branching into oblique lateral 

 nerves, generally forking once, rarely simple; substance of the leaves rather thin; 

 nervation distinct. 



This fern, common at Florissant, but always found in small frag- 

 ments, has no near relation to any fossil species known to me, being only 

 comparable to Sphenopteris Blomsfrandi, Heer, " Fl. Arct," i, p. 165, pi. 

 xxix, figs. 1-5, from the Miocene of Spitzbergen. In its form and its 

 nervation it is a. true Fhegopteris, closely related to some Cuban species, 

 F. sericea, P. divergens, &c. But from the absence of fructification an 

 exact comparison is not possible. 



Hah. — Florissant. Seen in most of the collections. 



ADIANTITES, Auct. 



A<liantite.s gracillinius, sp. nov. 



Plate XXI, Fig. 8. 



Racliis very slender, liliform, liexuous, bearing at its top a few simple entire 

 pinnules, oval in outline, sessile by the cuneate base, obtuse ; nervation dichotomous, 

 the medial nerves forking two or three times ; branches very oblique, forking near the 

 apex. 



I have seen only the small fragment figured, which is, however, dis- 

 tinctly preserved. By the disposition of the leaflets and their shape it 

 may be compared to Asplenites allosiiroides, Ung., " Fl. v. Sotzka," which has 

 small fructified pinnules ; but the nervation is that of Adiantim. 



Ilah. — Florissant. 



