JURASSIC FLORA OF DOUGLAS COUNTY, OREG. 67 



rather thick coriaceous texture, and, notwithstanding tlie fragmentary 

 condition of the specimens, are often very well preserved. They are 

 widest at base, attached by the entire base, and often strongly falcate. In 

 terminal parts they are sometimes shorter, less falcate, and more triangular 

 in form. They are in these parts more or less united, but usually are 

 separate to the base. They are acute to subacute. The nerves are very 

 distinct and are of the typical Cladophlebis type. The basal lateral 

 nerves are twice forked. Those higher up are less copiously branched, 

 the highest being once forked. The branches diverge strongly at first and 

 are then parallel, so that they appear rather straggling. 



This plant agrees very well with the form described by Heer from 

 the Jurassic of Siberia under the name Asplenium whitbiense tenue.'' It is 

 nearest his variety a, as figured on pi. xvi, fig. 8. 



As these ferns are not specifically identical with the original Pecopteris. 

 whitbiensis it seems best not to treat them as a variety of that species, and,, 

 as they are without fructification, it is safest to refer them to the noncom- 

 mittal genus Cladophlebis. They are very much like the Neuropteris 

 recentior (Phill.) L. & H., figured by Lindley and Hutton,'' but the pin- 

 nules are usually much more acute than those given for the English plant- 

 It may be, however, that the bluntness of those of the latter is due to 

 distortion or imperfect preservation, for a few of them are as acute as those 

 of the Oregon fossil and have exactly the same shape. 



Mr. Seward has been kind enough to send me, along with the names 

 of the plants figured, duphcates of the plates for his forthcoming work on 

 the Yorkshire Jurassic Plants. The plates were not accompanied by 

 descriptions, hence refei'ence can be made only to the plates and figures. 

 The work will be referred to as " Yorkshire Jurassic Fossils. " ' In his 

 paper entitled: "Notes on some Jurassic Plants in the Manchester 

 Museum," which deals with some of these plants, he has, on pp. 8-11, 

 brought together a large number of ferns of the whitbiensis type. In these 



«F1. Foss. Arct., Vol. IV, Pt. II, pp. 38-40, pi. xvi, fig. 8. ' 



6Fos. Fl. Gt. Brit., Vol. I, pp. 195-196, pi. Ixviii. 



« The work was not received in America till after Professor Fontaine's report had heen completed and the 

 manuscript and types sent by him to Washington in the spring of 1901. Copies arrived, however, before 

 the report had been embodied in this paper, and I have made free use of it in working out the synonymy 

 and arranging the species in systematic order. A copy of it was placed in Professor Fontaine's hands, and 

 there has been considerable correspondence between us relative to critical points. The final decision in all 

 cases, as proposed or accepted by him, has been embodied in the terminology here introduced. In the present 

 case he has decided to make a new species, and left the work of naming it to me. — L. F. W. 



