knowlton.j TERTIARY PLANTS OF NORTH AMERICA. 45 
Asplenium dubium Font. Potomac Fl., p. 109, pi. x, f. 9. 
Potomac formation : Fredericksburg, Virginia. 
Asplenium erosum (Lx.) n. comb. 
Pteris erosa Lx. Ann. Rept. U. S. Geo!, and Geogr. Surv. Terr., 1871, suppl., 
p. 12, 1871 [1872] ; Tert. FL, p. 53, pi. iv, f. 8, 1878; Cret. and Tert. FL, p. 
121, pi. xix, f. 1, 1883. 
Denver group: Golden, Colorado, etc. 
Asplenium Foersteri Deb. and EttJ Die urwelt. Acrobryen : 
(Denkschr. Wien. Akad., vol. xvii, p. 193), p. 13, pi. ii, f. 4-7, 11, 1859; 
Newby., Fl. Amboy Clays, p. 41, pi. iv, f. 1-11, 1895 [1896]. 
Amboy clay: Woodbridge, South Amboy, New Jersey. 
Asplenium martinianum Dn. Trans. Roy. Soc. Canada, vol. iii, sec. 
iv, p. 5, pi. i, f. 1, 1885 [1886]. 
Kootanie: Martin Creek, Anthracite, and North Fork Old Man 
River, British Columbia. 
Asplenium niobrara Dn. Trans. Roy. Soc. Canada, vol. i, sec. iv, p. 
20, pi. i, f. 1, 1882 [1883]. 
Peace River : Northwest Territory. 
Asplenium subcretaceum Sap. = Anemia subcretacea. 
Asplenium tenerum Lx. Cret. and Tert. Fl., p. 221, pi. xlviA, f. 1, 
2, 1883. 
Fort Union group : Bad Lands, Dakota. 
Asplenium subsimplex (Lx.) n. comb. 
Pteris subsimplex Lx. Ann. Rept. U. S. Geol. and Geogr. Surv. Terr., p. 392, 
1873 [1874] ; Tert. FL, p. 52, pi. iv, f. 5-7, 1878. 
Pteris anceps Lx. Ann. Rept. U. S. Geol. and Geogr. Surv. Terr., p. 376, 1872 
[1873]. 
Pteris undulata Lx. Bull. Mus. Comp. ZooL, vol. xvi, p. 43, 1888. 
Osmuuda major Lx. Cret. and Tert. FL, p. 121, pi. xviii, f. 5, 1883. 
Denver group: Golden, Sedalia, Colorado. 
Asplenium sp., Kn. Bull. Geol. Soc. Am., vol. viii, p. 140, 1897. 
Laramie?: North Fork Dutton Creek, Wyoming. 
Asplenium sp., Kn. Bull. Geol. Soc. Am., vol. viii, p. 133, 1897. 
Laramie: Lance Creek, Converse County, Wyoming. 
ATHROTAXOPSIS Fontaine. Potomac Fl., p. 239, 1889. 
Athrotaxopsis expansa Font. Potomac Fl., p. 241, pi. cxiii, f. 5,6; 
cxv, f. 2; cxvi, f. 5; cxvii, f. 6; cxxxv, f. 15, 18, 22, 1889. 
Potomac formation: Near Potomac Run, Trents Reach, Dutch 
Gap Canal, Virginia. 
Athrotaxopsis grandis Font. Potomac Fl., p. 210, pi. cxlv, f. 1-3; 
cxvi, f. 1-4; cxxxv, f. 10, 1889. 
Potomac formation : Fredericksburg and near Brooke, Virginia. 
Athrotaxopsis pachyphylla Font. Potomac Fl., p. 242, pi. cxv, 
f. 1, 3; cxvii, f. 1, 3-5, 1889. 
Potomac formation: Dutch Gap Canal, Virginia. 
