FLORA OF THF SHASTA FORMATION. 233 



there is a strong midnel'^■e. which, after the fashion of Pecopteris. is 

 maintained ^"ith ftill strength to near its end. The lateral nerves could 

 not be made out. 



This plant is probably a fUeichenia. a genus that, as Heer has made 

 known, is common in the Kome or Lower Cretaceous of Greenland. 

 Heer has shown that this genus passes up into the Atane or Unper ("i-e- 

 taceous of Greenland. This plant does not seem to bf . al with 



any of the Greenland species. It is more robtist and has larger piimules 

 than any of them. In the absence of fnictification it can not be deter- 

 mined with certainty as a Gleichenia. and the generic designation must 

 be left in dotibt. Of com"se. it can not be of much value in determining 

 the age of the strata that contain it. All that can be said of it is that 

 its age might be either Lower or Upper Cretaceous. 



Family :\LARSILEACE.E. 



Genus SAGEXOPTERI.-^ Presl. 



Sagexoptzkis Maxtelli (Duiiker) Schenk. 



PI. LXV. Figs. .30-35. 



1S46. CyclopUris ManielUDuiik.: Monogr. d. Xorddeutsoh. Wealdenbildimg, p. 10, 



pi. be. figs. 4. .5. 

 1S49. Adiantitfs ManieUi (Dunk.) Brongn. : Tableau, p. 107. 

 1869. Aneimidium Mantelli (Dunk.) Schimp.: Pal. Veg., Vol. I. p. 4S6: Atlas, 



pi. vvvi , fig. 13. 

 1S71. SagenopUrls Afant^Ui (Dunk.) Schenk: Palaeontographica. Tol. XIX. p. 222 



[20], pi. xxxi [x], fig. 5. 

 1894. GlossozamUe^ BJipsteini (Dunk.) Font, in Diller i)t Stanton: Bull. G^ol. Soc. 



Am.. Vol. V, p. 4.50. (PI. LX:^'. Figs. 32. 33.) 

 1S94. Sagenopteris ManitUi (Dunk.) Schenk. Font, in Diller & Stanton: Loc. cit. 

 1S9.5 [1S96]. Glossozamitfs Klipsfeini (Dunk.) Font, in Stanton: BuU. U. S. Geol. 



Surv.. Xo. 133. p. 1.5. (PI. LXV. Figs. 32. 33.) 

 1895 [1896]. Sagenopteris MantiUi (Dunk.) Schenk. Font, in Stanton: Loc. cit. 



Three imprints of single detached pimiules of a fern were fomid 

 at locahty Xo. 12." They occur on a fine-grained rock, which pre- 

 serA-es them well and shows the nen-ation l^eatitifully. The ner\-ation 

 and shape of the pinnules show that the plant is a Sagenopteris. An 



<» One of the specimens from locality Xo. 9. originallr referred by him to Glo^fosamitff Klipsli-irtl. is now 

 placed in this species. It is represented on PI. LXA", Figs. 30-3.5. — L. F. W. 



