538 MESOZOIC FLORAS OF UNITED STATES. 



bed, or is at least the same material, no attempt will be made to treat 

 the collections separately. Most of the fossils occur in limonite, and 

 some in a ferruginous sandstone highly charged with limonite. The 

 following is the list of species occurring here: 



Abietites angusticarpus Font 3 specimens. 



Athrotaxopsis expansa Font 57 specimens. 



Athrotaxopsis tenuicaulis Font 1 specimen. 



Baieropsis adiantif olia Font. ? 1 specimen. 



Brachyphj^llum parceramosum Font 29 specimens. 



Cephalotaxopsis ramosa Font. ? 3 specimens. 



Cladophlebis acuta Font 400 specimens. 



Cladophlebis acuta angustifolia Font. n. var 115 specimens. 



Cladophlebis alata Font 2 specimens. 



Cladophlebis Browniana (Dunk.) Sew. ? 2 specimens. 



Cladophlebis parva Font. 1 1 specimen. 



Cladophlebis Ungeri (Dunk.) Ward 1 1 specimen. 



Dioonites Buchianus (Ett.) Born.? 2 specimens. 



Dryopteris angustipinnata (Font.) Kn 13 specimens. 



Dryopteris fredericksburgensis (Font.) Kn 1 specimen. 



Dryopteris parvifolia (Font.) Kn 70 specimens. 



Glyptostrobus (Taxodium) expansus Font. n. comb 2 specimens. 



Osmunda dicksonioides Font. ? 1 specimen. 



Pecopteris virginiensis Font. ? 1 specimen. 



Protesephyllum oblongifolium Font 1 specimen. 



Rogersia longifolia Font. ? 3 specimens. 



Sequoia ambigua Heer 9 specimens. 



Sphenolepidium dentifolium Font. ? 1 specimen. 



Sphenolepidium Kurrianum (Dunk.) Heer 1 specimen. 



Sphenolepidium parceramosum Font. ? 9 specimens. 



Thinnfeldia marylandica Font. n. sp ■. 16 specimens. 



ThjTSopteris pachyrachis Font. ? 3 specimens. 



Cladophlebis acuta Fontaine. 



PL CXn^, Figs. 3, 4. 



1889. Cladophlebis acuta Font.: Potomac Flora (Monogr. U. S. Geol. Surv., Vol. 

 XV), p. 74, pi. V, figs. 7, 7a; pi. vii, figs. 6, 6a; pi. x, figs. 6, 6a, 7, 7a; pi. 

 xi, figs. 7, 7a, 8, 8a; pi. clxvi, figs. 5, 5a. 



This plant was described in Monograph XV from a comparatively 

 few specimens obtained from Virginia localities. It is veiy common at 

 the Arlington localities, being much the most abundant species there. 



