FLORA OF THE SHASTA FORMATION. 231 



and may be doubtfulh' referred to the Wealden species. The impressions 

 are of fragments of ultimate pinnae, which show a few pinnules without 

 sori. PI. LXV, Fig. 22, gives a representation of the best specimen found. 

 Fig. 23 represents the specimen formerlj^ referred with doubt to Osmu7ida 

 dicksonioides. 



It occurs at localities Nos. 9 and 21. 



Family GLEICHENIACEiE. 



Genus GLEICHENIA Smith. 



Gleichenia NoRDBNSKioLDi Heer? 



PI. LXV, Figs. 34-29. 



1874. Gleichenia NordensJcicMi Heer: Fl. Foss. Arct., Vol. HI, Pt. II (Kreide-Flora 



der Arctischen Zone), p. 50, pi. ix, figs. 6-12 (excl. figs, lie, llf). 

 1894:. Pecopteris strietinervis Font.? in Diller & Stanton: Loc. cit. (PI. LXV, 



Fig. 28.) 

 1894. Aspidimn JieterophyUwm Font., part, quoad Cat. U. S. Nat. Mus., Nos. .399.3 



and 3997 in Diller & Stanton: Loc. cit. (PI. LXV, Figs. 26, 27.) 

 1894. Osmunda diaksonioides Font.? in Diller & Stanton: Bull. Geol. Soc. Am., 



Vol. V, p. 450, quoad Cat. U. S. Nat. Mus., No. 4004. (PI. LXV, Fig. 29.) 

 1895 [1896]. Pecopteris strietinervis Font.? in Stanton: Bull. U. S. Geol. Surv., No. 



133, p. 15. (PI. LXV, Fig. 28.) 

 1895 [1896]. Aspidium heterophyllum Font., part, quoad Cat. U. S. Nat. Mus., Nos. 



3992 and 3997, in Stanton: Loc. cit. (PI. LXV, Figs. 26, 27.) 

 1895 [1896]. Osmunda dicTcsonioides Font.? in Stanton: Loc. cit., quoad Cat. U. S. 



Nat. Mus., No. 4004. (PL LXV, Fig. 29.) 



Small fragments of ultimate pinnae of a fern with pinnules iden- 

 tical in character with Heer's Gleichenia Nordenskioldi were found at 

 a number of localities. The specimens occur only in such small frag- 

 ments that positive determination of them can not be made. All that 

 can be said of them is that the plant is, so far as its character can be 

 made out, identical with Heer's fossil. The specimens are quite numer- 

 ous, showing that the plant was rather common. 



PI. LXV, Fig. 24, represents a fragment possessing the largest 

 pinnules seen, which belongs to the middle portion of some ultimate 

 pinna. Fig. 25 gives the terminal portion of an ultimate pinna with 

 small pinnules. None of the specimens seen were more complete than 

 these small fragments. Fig. 26 represents the specimen No. 3992 of 



