80 MESOZOIC FLORAS OF UNITED STATES. 



more here than elsewhere. They, however, do not seem to show such 

 copious forking here as the fossil of Lindley and Hutton. The follow- 

 ing seems to be their character: The lateral nerves go off at a right 

 angle, fork in a dichotomous manner, mostly at two-thirds of the dis- 

 tance from the midrib to the margin. Near the margin one or both 

 of the branches may fork again. The forking occasionally occurs nearer 

 the insertion of the nerves. The branches, after abruptly diverging, 

 become more or less parallel. The lateral nerves of both the English 

 and the Oregon plants form a very characteristic feature, and in the 

 Oregon fossil readily distinguish the plant if they are visible. There 

 is in the size and shape of the leaves no obvious general distinction 

 between this plant and Tceniopteris vittata Brongn. In leaves of this 

 type it could not be expected. The smallest forms of this plant resem- 

 ble in size the largest of T. vittata, but these are exceptions. As a rule 

 the plant now in question is much wider and less ribbon-shaped than 

 T. vittata. The lateral nerves differ decidedly. The same hand speci- 

 men of rock often shows several imprints of this fossil, and, in one case, 

 three leaves lie side by side as if they had formed a tuft of leaves 

 in growing. This aggregation of imprints is to be seen in the case of T. 

 vittata also. Some hand specimens show several imprints of both fossils. 



PL XIII, Fig. 1, gives a fragment from the middle part of the 

 frond mutilated, so as not to show its full width, the margin being miss- 

 ing. Indeed, it is rarely preserved in any of the specimens. Fig. 2 

 shows a portion of this enlarged. Fig. 3 shows the basal portion of 

 another frond. This also is mutilated. 



This plant occurs most commonly at locality No. 7, where it is 

 rather abundant. It occurs also at localities Nos. 1, 2, 16, 17, and 19. 



T^NioPTERis VITTATA Brongxiiart." 



PI. XIII, Figs. 4-8. 



1822. Scolopendrium sp. Young & Bird: Geol. Survey of the Yorksliire Coast, p. 



182, pi. ii, fig. 7. 

 1828. Tseniopteris vittata Brongn.: Prodrome, pp. 62, 199. 



"Mr. Seward (Jur. Fl. Yorksh. Coast, p. 157) places the following at the head of his synonymy of this 

 species: 

 "1823. Scitaminearum jolium, Sternberg, Flora der Vorwelt, iii, p. 42, pi. xxxvii, fig. 2." 



I find no such designation in Sternberg's work, and the language used by Mr. Seward seems to be borrowed 

 from Brongniart. In his Prodrome, p. 62, he says: "Tieniopteiis vittata: Scitaminearum folium ? Stemb., 

 fasc. 3, pag. 42, tab. 37, fig. 2; FiMcites ? ejusd. fasc. 4 {in indice iconxim)." Practicslly the same entry is 



