knowlton] TERTIARY PLANTS OF NORTH AMERICA. 155 
Osmunda dicksonioides latipennis Font. Potomac FL, p. 147, pi. 
lx, f. 1,3; lxi, f. 3, 1889. 
Potomac formation: Near Potomac Run, Virginia. 
Osmunda Doroschkiana Gopp. Abhandl. d. Schles. Gesel. f. Vaterl.- 
Cult., pt. ii, p. 203, 1861. 
Osmunda Torelli Heer. Fl. Foss. Arct., vol. v, abt. iii, p. 19, pi. i, f. 4, 1878. 
Lx., Proc. U. S. Nat. Mus., vol. v, p. 444, 1882 [1883]. 
Hemitelites Torelli Heer. Op. cit., vol. ii, abt. iv, p. 462, 1869. 
Pecopteris Torrellii Heer. Op. cit., vol. i, p. 88, pi. i, f. 15, 1868. 
Eocene?: Unga Island, Alaska. 
Osmunda major Lx.= Asplenium subsimplex. 
Osmunda Obergiana Heer. Fl. Foss. Arct., vol. iii, abt. ii, p. 98, pi. 
xxvi, f. 9-9b; xxxii, f. 7a, 1874; Ward, 15th Ann, Kept. U. S. Geol. 
Surv., p. 390, 1895. 
Potomac formation : ? 
Osmunda sphenopteroides Font. Potomac FL, p. 145, pi. xxv, f. 13, 
1889. 
Potomac formation: Dutch Gap Canal, Virginia. 
Osmunda Torelli Heer =Osmunda Doroschkiana. 
OSTRYA Scopoli. Fl. Cam., p. 414, 1760. 
Ostrya betuloides Lx. Cret. and Tert. Fl., p. 151, 1883. 
Green Eiver group: Florissant, Colorado. 
Ostrya Walkeri? Heer. Vierteljahrsschrift d. Naturf. Gesells. 
Zurich, vol. xi, p. 276, 1866; Lesquereux, Proc. TJ. S. Nat. Mus., vol. 
x, p. 38, 1887. 
Pleistocene?: Wytheville, Virginia. 
Ostrya virginica (Mill.) B. S. P. Hollick, Bull. Torr. Bot. Club, vol. 
xix, p. 332, 1892. 
Miocene ? : Bridgeton, New Jersey. 
OXYCOCCUS Adanson. PI. Fain., vol. ii, pi. 164, 1763. 
Oxycoccus palustris Pers. Penhallow, Trans. Roy. Soc. Canada, 2d 
ser., vol. ii, sec. iv, p. 72, 1896. 
Pleistocene: Scarboro Heights, Ontario. 
OTTELIA Pers. Syn., vol. i, p. 400, 1805. 
Ottelia americana Lx. Ann. Kept. U. S. Geol. and Geogr. Surv. 
Terr., p. 300, 1874 [1876]; Tert. Fl., p. 98, pi. lxi, f. 8, 1878. 
Montana formation: Point of Rocks, Wyoming. 
P AG-IOPHYLLUM Heer. Contr. Fl. Foss. du Portugal, p. 11 , 1881 . 
Pagiophyllum dubium Font. Proc. IT. S. Nat. Mus., vol. xvi, p. 271, 
pi. xxxix, f. 2-11, 1893. 
Trinity division : Glenrose, Texas. 
Pagiophyllum sp., Dn. Trans. Roy. Soc. Canada, vol. x, sec. iv, p. 90, 
f. (in text) 14, 1892. 
Kootanie: Anthracite? British Columbia, 
