116 THE POTOMAC OR YOUNGEE MESOZOIC FLORA. 



This plant is more like Macrotceniopteris ovata Schiinper, Tceniopteris 

 ovalis Oldham and Morris, from Biiidrabun, India, than any other described 

 fossil. The apparent stipe in the plant of Oldham and Morris seems to 

 be simply a portion of the midnerve stripped of the lamina of the pinnnle. 



Angiopteridium strictinerve, sp. nov. 



Plate XXIX, Figs. 8, 9. 



Frond pinnate ; principal rachis stout and rigid ; pinnules elongate- 

 lanceolate ; midnerves strong, rounded, and prominent ; leaf substance 

 thick ; lateral nerves closely placed, forked mostly at their insertion, 

 rarely higher up, sometimes simple, branches simple and parallel, arched 

 near the base strongly backward and above curved slightly forward, thin 

 but distinct. 



Locality : Fredericksburg ; rare. 



Although rare, this is the most common species of the genus at 

 Fredericksburg. In the shape of the pinnules and in the course of the 

 lateral nerves it is something like Olenndridium tenuinerve Schimper, 

 Tceniopteris tcnuinervis Brauns, as figured by Schenk,^ but that is a simple 

 frond. 



Angiopteridium strictinerve, var. latifolium. sp. nov. 



Plate XXX, Figs. 1, f>. 



Frond unknown; pinnules larger -than in the normal A. strictinerve, 

 in some cases, as in Fig. 5, attaining the width of 44™"; midrib com- 

 paratively stout ; lateral nerves fine but distinct and sharply defined, often 

 simple, forking at the base or higher up, branches simple and parallel, 

 arched backward in the lower portion of the lateral nerves and then 

 inclined forward. 



Locality : Fredericksburg ; rare. 



This plant is in some points similar to Angiopteridium nervosum, 

 described elsewhere, but the nerves are finer and more closely placed. In 

 Fig 1 there are two fragments of pinnules so placed as to indicate that 

 they belong to the same frond, coming off pinnately from a common 

 rachis. 



' Foss. Flor. der Greuzschichten., PI. XXV, Fig. 3. 



