KNOWLTON.) 
TERTIARY PLANTS OF NORTH AMERICA. 187 
PTENOSTROBTTS Lesquereux. Cret. Fl., p. 114, 1874. 
Ptenostrobtis nebrascensis Lx. Gret. FL, p. 114, pi. xxiv, f. 1, 1874. 
Dakota group: Winnebago Village, Missouri River. 
PTERIS Linnaeus. Gen. PI , p. 322, 1737. 
Pteris affinis Lx. = Osmunda affinis = Asplenium subsimplex. 
Pteris anceps Lx. = Osmunda affinis = Asplenium subsimplex. 
Pteris dakotensis Lx. Fl. Dak. Gr., p. 24, pi. i, f. 2, 3, 1892. 
Dakota group: Kansas. 
Pteris elegans Newby. Proc. IT. S. Nat. Mus., vol. v, p. 503, 1882 
[1883]. 
Miocene?: Currant Creek, Oregon. 
Pteris erosa Lx. = Asplenium erosum. 
Pteris (Oleandra) glossopteroides Dn. Trans. Roy. Soo. Canada, 
vol. i., sec. iv, p. 24, pi. iv, f. 16, 1882 [1883]. 
Upper Cretaceous: Protection Island. 
Pteris Gardneri Lx. = Gymnogramma Gardneri. 
Pteris pinmeformis Heer, Lx.=Pteris pseudopinna^formis. 
Pteris pseudopinnceformis Lx. Tert. FL, p. 52, pi. iv, f. 3, 4, 1878. 
Pteris pinnseformis Heer. Lesquereux, Ann. Rept. U. S. Geol. and Geor. Surv. 
Terr., p. 384, 1870 [1771] ; ibid , p. 283, 1871 [1872] . 
Denver group: Golden, Colorado. 
Pteris Russellii Newby. Proc. U. S. Nat. Mus., vol. v, p. 503, 1882 
[1883]. 
Laramie group : Vermejo Canyon, New Mexico. 
Pteris Sitkensis Heer. Fl. Foss. Alask., p. 21, pi. i, f. 7a, 1869. 
Eocene?: Near Sitka, Alaska; Mackenzie River. 
Pteris subsimplex Lx. = Asplenium subsimplex. 
Pteris umlulata Lx.= Asplenium subsimplex. 
PTEROCARYA Kunth. Ann. Sci. Nat., 1st ser., vol. ii, p. 345, 1824. 
Pterocarya americana Lx. Ann. Rept. IT. S. Geol. and Georg. Surv. 
Terr., p. 417, 1873 [1874]; Tert. Fl., p. 290, pi. Iviii, f. 3, 1878. 
Green River group: Middle Park, Colorado. 
Pterocarya retusa Lx. Bull. Mus. Comp. Zool., vol. xvi, p. 50, 1888. 
Denver group : Golden, Colorado. 
PTEROPHYLLUM Brongniart. Prodr. Hist. Veg. Foss., p. 95, 1828. 
Pterophyllum? Haydenii Lx. = Podozamites Haydenii. 
Pterophyllum californicum Font, in Diller and Stanton. Bull. Geol. 
Soc Am., vol. v, p. 450, 1894. Nomen nudum. 
Knoxville beds: Tehama County, California. 
PTEROSPERMITES Heer. Fl. Tert. Helv., vol. iii, p. 30, 1859. 
Pterospermites cordatus Ward. Bull. U. S. Geol. Surv., no. 37, p. 
93, pi. xli, f. 4, 1889. 
Fort Union group: Seven-Mile Creek, Montana. 
