172 MESOZOIC FLOKA.S OF UNITED STATES. 



1889. Xageiopsis longifoJia Font.: Potomac Flora (Monogr. U. S. Geol. Surv.. Vol. 

 XV), p. 19.5, pi. Ixxv, figs. 1, la, lb; pi. Ixxvi, figs. 2-6; pi. Ixxvii. figs. 1, 

 2; pl. Ixxviii, figs. 1-.5: pi. Ixxix, fig. 7; pi. Ixxxv, figs. 1. 2, 8, 9. 



1902. Xageiop.nslongifolia Font. Schrader: Bull. Geol. Soc. Am., Vol. XIII, p. 24.5. 



A considerable iiuml^er of fragments of detached, narrow, strap- 

 .shaped leaflets occur in all the collections. All of those in Mr. Schrader's 

 collection are found on a single rock fragment. Lesquereux does not 

 seem to have noticed those in Mr. Woolfe's collection. At least he 

 gives no description of them. He may have regarded them as forms 

 of Podozamites latipennis Heer, but they are quite different from some 

 of the fossils he identified with this species. They are uniformly narrow 

 and for most of the leiigth of the fragments do not differ in width, so 

 that the margins are parallel. They also narrow more at base than 

 the true P. latipennis, and seem to have been attached l:)y a short pedicel, 

 which is not the case with Heer's plant. None of these leaflets are com- 

 plete. They all lack the terminal parts. As none of them are attached, 

 and in only one case is the basal end visible, it is not possible to determine 

 them positively. 



The fragment occurring on one of the rock specimens obtained by 

 Mr. Dumars shows a length of 10 cm., with both the Ijasal and the ter- 

 minal portions lacking. The average width is II mm., which it main- 

 tains to near one end, where it is narrowed to 9 mm. This is apparently 

 the basal end, but a portion is still lacking here. This is given in PI. 

 XLV, Fig. 1. The nerves are rather remote. They are parallel and, 

 as shown in one of the imprints in which the base is preserved, fork 

 only on leaving the pedicel. ^lost of the imprints are shorter fragments 

 in which the margins of the leaflets and the nerves are parallel. The 

 width of the leaflet given in Fig. 1 seems to be the average one, Ijut 

 there are narrower ones, having a width of 7 mm., and wider ones, with 

 a width of 14 mm. One of these larger leaves is shown in Fig. 2. This 

 has a length of 95 mm. It narrows at one end to 7 mm., after the fashion 

 of the one shown in Fig. 1 . This represents the specimen referred by 

 Lesquereux to Bniern palmata Heer. One of the smaller leaves, with 

 a maximum width of 7 mm., is shown in Fig. 3. This occurs on one 

 of the rock fragments obtained by Mr. Schrader. It shows the base 

 of the leaflet and the mode of narrowing and rounding off there, but 

 the pedicel is lacking. This sp^ci'^^'i p-i-v^s the l)ase better preserved 



