JURASSIC FLORA OF DOUGLAS COUNTY, OREG. 83 



Three specimens of a fine tseniopteroid plant were found at locality- 

 No. 7. It agrees so well with Macrotceniopteris calif ornica of the Oroville 

 flora that I have no hesitation in regarding it as the same. The Oregon 

 specimens are better preserved than those found at Oroville and show 

 the margins. The plant must have had a very thick leather-like texture, as 

 it leaves on the rock a decided film of coal. The maximum width shown 

 is 6 cm. The greatest length seen is 14 cm. and this in a mere fragment. 

 The midnerve is strong. The lateral nerves are seen with difficulty. 

 They are mostly unforked and parallel to one another. They are rather 

 remote, being about three-fourths of a millimeter apart. Some are forked 

 at rather more than half way between the midrib and margin. The fork- 

 ing, however, appears, as it were, accidental and not essential. The plant 

 resembles Saporta's Tceniopteris superba," but the nerves are more remote 

 and not forked at the base, as in Saporta's fossil. 



PL XIV, Fig. 1, gives the basal portion of a leaf. Fig. 2 represents 

 a considerable part of a leaf from some distance above the base, indicating 

 a leaf of great length. Fig. 3 gives a fragment in which the nerves are 

 visible, and Fig. 4, a portion of this enlarged. 



Family MARSILEACE.F]. 



Genus SAGENOPTERIS Presl.* 



Sagenopteeis Gceppertiana Zigno. 



PL XIV, Figs. 5-11. 



1865. Sagenopteris Gceppertiana Zign.: Osserv. sulle Felci Fossili dell'Oolite, p. 36. 



1865. Sagenopteris Brongniartiana Zign.: Loc. cit. 



1865. Sagenopteris Brauniana Zign.: Loc. cit. 



1865. Sagenopteris rotundata Zign.: Loc. cit., p. 35. 



1868. ? Sagenopteris Gceppertiana Zign.: FL Foss. Form. Oolith., VoL I, p. 188, pL 



xxi, figs, la, lb, 2-5; pL xxii, figs. 1, 2. 

 1900. Sagenopteris Nilsoniana (Brongn.) Ward: Twentieth Ann. Rep. U. S. GeoL 



Surv., 1898-99, Pt. II, p. 352, pL Ivi, fig. 1; pL Ixvii, fig. 2. 



"Plantes Jurassiques, Vol. I, pp. 439-441, pi. Ixi; pi. Ixii, fig. 1. 



6 Potonii?, who is working up the Pteridophyta for Engler and Prantl's Natiirliche Pflanzenfamilien, 

 classes this genus in the Marsileacese, following the views of Heer, Zigno, Feistmantel, Nathorst, and others; 

 but Count Solms-Laubach sees reason to doubt the correctness of this, and Seward treats Sagenopteris as a 

 fern, classing it now (Jur. Fl. Yorkshire Coast, 1900, p. 161 ) in the family Polypodiacese, although in his 

 Wealden Flora, 1894, p. 129, he placed it in the Schizeacea;. — L. F. W. 



