warp] TRIASSIO FLORA OF YORK COUNTY, PENNSYLVANIA. 239 
Professor Fontaine says of this specimen: 
This plant, left in doubt by Mr. Wanner, is almost certainly Pseudodansopsis 
reticulata. It has the copious anastomosis, with the thick and smooth leaf substance 
of that plant. r 
Mr. Wanner’s statement with regard to it is as follows: 
The specimen Fig. 1, Pl. XXV, contains neither base nor tip, and reveals the nerva- 
tion shown in Fig. 2 on but a small part of the surface. The nerves are not easily 
distinguished, evidently because of the thickness of the leaf substance, as indicated 
by the impression. The midrib is prominent and stout. This is the only specimen 
of its kind found, though several other impressions somewhat similar, in which 
no venation can be traced, may belong to the same species. 
Locality.—N. C. R. R. cut, south of York Haven. 
Genus LONCHOPTERIS Brongniart. 
LONCHOPTERIS OBLONGA (Emmons) Fontaine. 
Pl. XXV, Figs. 3-5. 
1856. Acrostichites oblongus Emm.: Geological Report of the Midland Counties of 
North Carolina, p. 326, pl. iv, figs, 6, 8. 
1857. Acrostichites oblongus Emm.: American Geology, Part VI, p. 101, pl. iv, figs. 
6, 8. 
1883. Lonchopteris oblongus (Emm.) Font.: Older Mesozoic Flora of Virginia, Mon. 
U. 8. Geol. Survey, Vol. VI, p. 103, pl. xlix, figs. 1, la. 
Mr. Wanner correctly classed this in the genus Lonchopteris. Pro- 
fessor Fontaine says: 
This is much like Lonchopteris oblongus of the North Carolina Mesozoic, and most 
probably is that plant. The pinnules are not smaller than many of those of the 
North Carolina fossil; the nervation is also similar. The only difference is that the 
York fossil has a distinct granulation, strikingly like the fructification of Acrosti- 
chites. As, however, the fructification of L. oblongus is not known, this feature does 
not preclude the identification of the York fossil with that of North Carolina. 
The following are Mr. Wanner’s notes: 
Assuming that the specimens, Figs. 3~5, Pl. XX V, are pinne of acompound fern, the 
shape of the pinnules, together with the elliptical meshes formed by the anastomos- 
ing nerves, Fig. 5, refer this impression to Lonchopteris. The pinnules, however, 
are very much smaller in proportion to the length of the pinne than in L. virginiensis, 
nor are they so closely crowded together, moreover they show a very pronounced . 
variation in size and shape near the base of the pinne. 
Locality.—N. C. R. R. cut, south of York Haven. 
Genus SAGENOPTERIS Presl. 
SAGENOPTERIS sp. Fontaine. 
Pl. XXV, Fig. 6. 
The very defective character of this specimen makes it doubtful 
whether it is best to admit it.at all, but in view of the special interest 
attaching to the York florula it may stand as a stimulus to further 
