Maryland Geological Survey 501 



EoGERSiA ANGUSTiFOLiA Fontaine 



Rogersia angustifoUa Fontaine, 1890, Mon. U. S. Geol. Surv., vol. xv, 1889, 

 p. 288, pi. cxliii, fig. 2; pi. cxlix, figs. 4, 8; pi. cl, figs. 2-7. 



Saliciphyllum longifoUum Fontaine, 1890, Mon. U. S. Geol. Surv., vol. xv, 

 1889, p. 302, pi. cl, fig. 12. 



Rogersia angustifoUa Fontaine, 1906, in Ward, Mon. U. S. Geol. Surv., vol. 

 xlviii, 1905, p. 521 (non pp. 491, 510). 



Description. — " Leaves narrow, small, very elongate-oblong, narrowed 

 gradually to the base and apex, subacute, sometimes curved ensiform; 

 midnerve proportionally very strong, with a thick petiole; lateral or 

 primary nerves very slender, going off at an acute angle and arching 

 up towards the summit, forming more or less persistent nerves approxi- 

 mately parallel with the margin, and having a flexuous course. They 

 send off very obliquely slender lateral nerves, which anastomose with 

 the adjacent ones, and form irregular, elongate, polygonal meshes, with 

 their longer dimensions directed upwards. The latter, by splitting up 

 into ultimate nerves, form an irregular, lax, ultimate network/^ — 

 Fontaine, 1890. 



No new material which can be referred to this species has been 

 collected. 



Occurrence. — Patuxent Formation. Fredericksburg, Potomac Eun, 

 Virginia. Arundel Formation. Langdon (?), District of Columbia; 

 Bay View, Maryland. 



Collection. — U. S. National Museum. 



Eogersia angustieolia parva Fontaine 



Rogersia angustifoUa parva Fontaine, 1906, in Ward, Mon. U. S. Geol. 

 Surv., vol. xlviii, 1905, p. 523, pi. cxi, fig. 9. 



Description. — " At this locality five specimens of a dicotyledon were 

 found that, indicate a smaller and narrower leaf than the normal 

 Rogersia angustifoUa. In fact, the leaves are so narrow that they sug- 

 gest Ceplialotaxopsis magnifolia. The nervation, however, although 

 vaguely shown, is that of a dicotyledon, and the leaf substance is thinner 

 than that of a Cephalotaxopsis. This may be a new genus, but the 

 amount of material is too small and the preservation too imperfect to 



