FLORA OF THE GREEN RIVER GROUP. 137 



LYCOPODIACEiE. 



LYCOPODIUM, Linn. 



Lycopodittm; proniineiis, Lesqx. 

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



FILICES. 



SPHENOPTERIS, Phill. 



Sphenopteris Guyottii, ep. nov. 



Plate XXI, Figs. 1-7. 



Ultimate pinnae linear-lanceolate, of various lengths; raehis narrow and narrowly 

 winged by the decnrrent 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, piunately branching into oblique lateral 

 nerves, generally forking once, rai'ely 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 Blomstrandi, Heer, " Fl. Arct," i, p. 155, pi. 

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

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

 P. 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. 

 Adiantites graeillimus, sp. nov. 



Plate XXI, Fig. 8. 



Racliis very slender, filiform, flexuous, bearing at its top a few simple entire 

 pinnules, oval in outline, sessile by the cmieate 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 allosuroides, Ung., " Fl. v. Sotzka," which has 

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



Hah. — Florissant. 



