158 MESOZOIC FLORAS OK IMIKD STATKS. 



reux's Xo. 9091). This is given by Lesquercux as Pccoptcris dcnticuUita 

 Heer. He gi\-es no description and no figure of it. The imprint shows 

 several imperfect ultimate pinn:r cariying a nunihci' of mostly mutilaled 

 pinnules. The j)iiuue are detached, hut so placed as to show tlial they 

 were once attached to a common rachis. Enough, however, of the char- 

 acter of this plant is shown to make it most probal)le that it is identical 

 with CIndophlcbis i^acccnsis, found in the Jiu'assic (Lower Oolite) flora of 

 Douglas County, Oreg., and descrilied on page 66. Only one specimen 

 of this fossil occurs in the collections. It is represented in PI. XXXIX, 

 Fig. 7, and one of the piimules with its attachment to the rachis is shown 

 in Fig. 8. 



Cladophlebis alata Fontaine. 



PI. XXXIX, Figs. 9-11; I'l. XL. 



1SS8. Aspidium Oerstedi Heer. Les(|uereux: Proc. L. S. Nat. Mus., Vol. XI, p. 32 



in part, quoad Cat. U. S. Nat. Mus. No. -24.34, Lesqiiereiix'.s Nos. 910b, 



910c, 911b, 912, 916, 917. 

 1«88.? Pinus staratschini Heer. Lesquereux: Proc. U. S. Nat. Mus., Vol. XI, p. 32. 

 1889. CladopJihhis alata Font. : Potomac Flora (Monogr. V. S. Geol. Sin-v., Vol. XV) , 



p. 77, pi. xix, ligs. 5, 5a. 

 1889. Pecopteris strictinervis Font.: Op. cit., p. 84, pi. xiii, figs. (5, 6a, 7, 7a, 8, Sa; 



pi. xix, figs. 9, 9a; pi. xx, figs. 3, 3a; pi. xxii, tigs. 13, 13a: j)i. elxx, figs. 5, 



•5a, 6, 6a. 



The most common, and perhaps the most characteristic fern of 

 the two collections, is one of those that Lesquereux identified with 

 Aspidium Oerstedi Heer, although it is entirely different from that plant 

 and the others of Woolfe's collection that he placed in that species. 

 Some of the larger rock fragments contain a numl)er of imprints. The 

 amount of material enables one to get a pretty good idea of the character 

 of the fossil. The specimens seem all to l)elong to parts pretty high up 

 on the pinna\ The most complete specimens show a considerable portion 

 of an antepenultimate pinna, which carries portions of several penul- 

 timate and ultimate pinnje containing a number of pinnules. WluMlicr 

 or not this represents the frond or only a compound pinna cnii nol be 

 determined. It is probably only a pinna. It shows that the frond 

 must have been of consider'able dimensions and that the plant was 

 probably arborescent. The rachises are strong and rigid. The primary 

 and secondarj' rachises of this specimen, given in PI. XL, Fig. 1, seem 



