FONTAINE.] THE OROVILLE FLORA. 345 
Genus CLADOPHLEBIS Brongniart. ; 
CLADOPHLEBIS SPECTABILIS (Heer) Fontaine. 
Pl. XLIX, Figs. -4, 5. 
1876. Asplenium (Diplazium) spectabile Heer: Jura-Flora Ostsibiriens,. Fl. Foss. 
Arct., Vol. IV, Pt. II, pp. 96, 120, pl. xxi, figs. 1, 2a, 2c, 2d. 
1896. Cladophlebis spectabilis (Heer) Font.: Am. Jour. Sci., 4th Ser., Vol. II, p. 274. 
This beautiful and well-characterized fern was found in two, pretty 
well-preserved specimens at the locality ‘‘Bank of Feather River, 
one-half mile south of the Banner mine.” The specimens show only 
detached portions of ultimate pinne. The specimen given in Pl. 
XLIX, Fig. 4, shows portions of three ultimate pinne in a position 
that they would have if they had been attached to a principal rachis. 
This specimen shows that the fern was at least bipinnate. The plant 
was clearly a large one, and it was probably subarborescent. The 
rachises are strong and rigid. The pinnules are large and closely 
placed, but separate to their bases. Their ends are very obtuse and 
‘their texture seems to have been thin. Themidnerve of the pinnules 
is sharply defined, but not very thick. The lateral nerves are very 
distinct, but not strong; they fork twice, the forking taking place 
near the midnerve. The branches diverge suddenly, and then go 
nearly parallel until they reach the margins of the pinnules. 
The general aspect of this plant is not common among ferns, and 
hence it can be easily recognized, and there is not much danger of 
confounding it with other species. This fact gives to even small frag- 
ments a value not possessed by less well-defined forms. 
Fig. 4 gives the most complete specimen, and Fig. 5 a pinnule of 
the same, magnified to show details. 
This plant is no doubt identical with that described by Heer as 
Asplenium spectabile from the Jurassic formation on the upper Amur, 
in Siberia.! Heer regards the species as an Asplenium on the strength 
of supposed sori that he saw on his specimens. Nothing resembling 
sori was seen on the Oroville plants. The species clearly belongs to 
the Cladophlebis type of fern. I prefer to call all ferns of this type 
Cladophlebis and not to identify them with living species in the absence 
of satisfactory proof. 
CLADOPHLEBIS ARGUTULA (Heer) Fontaine. 
Pl. L, Figs. 1-6. 
1876. Asplenium argutulum Heer: Jura-Flora Ostsibiriens, FI. Foss. Arct., Vol. IV, Pt. 
TI, pp. 24, 41, 96, 118, 120, pl. iii, figs. 7, 7b, 7c, 7d; pl. xix, figs. 1, 1b, 2, 
3, 3b, 3c, 4. 
1896. Cladophiebis argutulus (Heer) Fontaine : Am. Jour. Sci., 4th Ser., Vol. II, p. 274. 
1 Flora Foss. Arct., Vol. IV, Pt. Il, Beitrige zur Jura-Flora Ostsib. und des Amurlandes, pp. 96, 97, 
pl. xxi, figs. 1, 2a. 
