* 492 FOSSIL PLANTS FROM MONTANA—FONTAINE. | 
as distinct species. Fig. 1 shows the normal forms of the specimens, 
These differ from the Virginia plant perhaps enough to make the Great 
Falls forms a variety. They do not, however, show any fructification. 
Most of the specimens are in a ferruginous ee which is the material 
carrying the imprints of Osmunda dicksonioides. This appears to come 
from a different horizon from that yielding Aspidiwm montanense. Some | 
of the forms approach pretty closely to some of those of the last-named — 
plant, but the toothing of the pinnules is different. The normal pin- 
nules are long and slender, rather remote, somewhat constricted at base, 
with the lower side decurrent by a narrow wing, which, in most of the — 
pinnules, unites with the base of the next lower one. The margins — 
show a shallow crenate toothing. The nerves are in the main like 
those of the Potomac plant. They are single in each crenate lobe, | 
forking about midway their length, and diverging widely in the lobes. | 
Pecopteris montanensis, sp. nov. 
PLEX, Re ae 
Frond bipinnate to bipinnatifid. Leaf substance thick, ultimate pin- | 
ne alternate and subopposite. Rachises of different orders strong. — 
Lower pinnules small, united at: base for some distance up, spatulate 
to broadly elliptical in form, subacute,. strongly convex in outline on | 
the upper outer margin. Pinnules of the upper part of the frond and © 
terminal portions of the ultimate pinne still more united, narrowly | 
ellipticalin form. Nerves single in each pinnule and lobe, strong, once 
forking, with branches widely diverging, the anterior branch ending in 
the tip of the pinnule or lobe and the posterior one in the upper outer — 
margin. 
This small fern is well characterized and seems to be new. Asit © 
shows only two specimens its full character can not be made out. For — 
this reason I place the plant provisionally in the genus Pecopteris, as 
in foliage it is most nearly connected with it. In the form of its pin- 
nules it is much like Pachypteris ovata Brongn., but the leaf substance | 
is much thinner and the nerves are different. Fig. 1 gives pinne from — 
the lower part of the frond and 1a gives several pinnules enlarged to 
show nervation. 
Pecopteris Browniana ? Dunker. ‘i 
Five imprints of small fragments of a fern very near te Pecopteris | 
Browniana, and most probably identical with it, occur in the collections. 
Most of them are in a ferruginous sandy aeaie of reddish color, which | 
is the material that carries the impressions of Osmunda dickaoniosdal : 
These differ slightly from those that occur in grayish shale, which are | 
nearer the typical forms. They are, however, imprints of the terminal 
portions of compound pinne, a part of the frond that usually shows much 
variation in the shape of the pinnules. The pinnules of these a 
+ & 
