WARD.] TRIASSIC FLORA OF YORK COUNTY, PENNSYLVANIA. 241 
The following is Mr. Wanner’s note: 
Whilst the exact shape of the pinnules of the frond, Pl. XXV, Fig. 9, can not be deter- 
mined easily, the opposite is true of the nervation. The lower pair of lateral nerves 
forks twice (Fig. 10), all the rest but once. The pinnee are broken off at each end. 
Only one other specimen was found. 
Locatity.—N. C. R. R. cut, south of York Haven. 
Class EQUISETALES. 
Family EQUISETACEA. 
Genus EQUISETUM Linneus. 
EqQuisETUM Rogersn (Bunbury) Schimper. 
Pl. XXV, Figs. 11,12. — 
1851. Calamites Rogersii Bunb.:! Quart. Jour. Geol. Soc. London, 1851, Proceedings, 
p. 190. 
1869. Equisetum Rogersii (Bunb.) Schimp.: Traité de Paléontologie Végétale, Vol. I, 
p. 276. 
Professor Fontaine says of this: 
Mr. Wanner indicates by question his doubt regarding the species. He has, with- 
out doubt, in his collection a large fragment of a crushed stem of E. Rogersii, show- 
ing several nodes and the imprint of a portion of the outer surface of the plant. 
There are also several small imprints of Equisetum, which suggest the presence of 
E. Muensteri, but they are too vague to justify this identification. : 
The following is Mr. Wanner’s description: 
The compressed and distorted specimen, Fig. 11, unmistakably reveals the fact in 
its nodes and appearance that it belongs to the Equisete. No otherspecimens were 
found to shed additional light on its individuality, though a still more fragmentary 
impression made by another member of the same family is illustrated in Fig. 12. 
Locality.—The pumping station, N. C. R. R. cut, 600 feet above 
the plant-bearing shales. 
1§pecimens of this species had been several times described and figured by other authors, who 
confounded it with the Carboniferous species Calamites Suckowii Brongn. Brongniart distinguished 
it as var. 6 (Hist. Vég. Foss., p. 125, pl. xvi, fig. 1). 
20 GEOL, PT 2 16 
