Maryland Geological Survey 293 



TiENioPTERis auriculata (Fontaine) Berry 



Angiopteridium auriculatum Fontaine, 1890, Mon. U. S. Geol. Survey, vol. 



XV, 1889, p. 113, pi. vii, figs. 8-11; pi. xxviil, fig. 1. 

 Twniopteris auriculatum Berry, 1910, Proc. U. S. Natl. Mus., vol. xxxviii, 



p. 634. 



Description. — "Frond pinnate; pinnules thick and leathery, long 

 linear, subacute, remotely placed, free to the base, auriculate at base, 

 attached by the midrib alone ; auricles of the bases of the pinnules over- 

 lapping the upper surface more or less; midrib of pinnules rather stout 

 and rigid; lateral nerves often obscurely shown, fasciculate or bifurcate, 

 and towards the tips simply forked. 



" The plant is rare at each locality, but is most common at Fredericks- 

 burg. It is something like Pteris lohgipennis Heer,^ but there is no 

 reason to think that it is a Pteris. It also resembles Pecopteris salici- 

 folia ^ Oldham and Morris. The forms figured in figs. 8, 9, 11 occur at 

 Fredericksburg; fig. 10 occurs at the locality near Potomac Eun. This 

 is different from the others in the great length of the pinnules and in the 

 fasciculate nerves, which are bifurcate, with the branches again forking 

 near their tips. The nerves are obscure on the upper surface of the 

 pinnules. The main rachis is stout and keeled on the under surface, as 

 is shown in fig. 9. On the upper surface the auricles at the base of the 

 pinnules overlap more or less the surface of the main rachis." — Fontaine, 

 1890. 



No new material referable to this species has been collected. 



Occurrence. — Patuxent Formation. Fredericksburg and Potomac 

 Run, Virginia. 



Collection. — ^U. S. National Museum. 



TiENioPTERis NERVOSA (Fontaine) Berry- 

 Plate LXXVII, Fig. 1 



Angiopteridium nervosum Fontaine, 1890, Mon. U. S. Geological Survey, 



vol. XV, 1889, p. 114, pi. xxix, fig. 2. 

 Angiopteridium densinerve Fontaine, 1890, Mon. U. S. Geol. Surv., vol. rv, 



1889, p. 115, pi. xxix, fig. 4. 



^ Heer, Foss. Fl. Arct., Band vi, Abth. ii, pi. x, figs. 5-13. 

 ^ Foss. Flora of the Rajmahal series, pi. xxvii, fig. 2. 



