FONTAINE | THE OROVILLE FLORA. 349 
least 26 cm. long. The fronds taper gradually from near the middle 
toward their base and tip, so that they are narrowly elliptical in 
shape. The midrib is strong, prominent, and rounded. The lateral 
nerves go off nearly at right angles, curve slightly away from the 
midrib, and then, near the margin, curve slightly toward the ends of 
the fronds. They are parallel throughout their course, very fine but 
distinct, and very closely placed, being about three in the space of 
1mm. The leaf substance is thick and durable, giving the pinnule a 
rigid aspect. No entire specimen was seen. 
This plant is by far the most common fossil at Oroville. It occurs 
abundantly at the localities ‘‘Bank of Feather River,” etc., and ‘‘In 
the bed of a ravine that leads from the Banner mine,” etc. It is very 
near the plant figured and described by Saporta’ as Twndopteris tenwi- 
nervis Brauns, from the Infralias of France. From an inspection of 
the material afforded by Stanton’s collection it was regarded as identi- 
cal with Saporta’s plant. This species varies a good deal in dimen- 
‘sions, and from the imperfect material in the above-mentioned collec- 
tion the writer supposed that another species figured by Saporta from 
the same formation, viz, 7. stenonewra Schenk, was also present. 
‘The very abundant and well-preserved material collected by Messrs. 
Ward and Storrs establishes a complete gradation between all the 
forms of Teniopteris found at Oroville, and shows that only one 
species exists there. In addition, it makes it pretty clear that this is 
a new species. The larger specimens much surpass in size any of 
Saporta’s, and, what is of more importance, the nerves are finer, more 
closely placed, and they do not fork at any point. : 
Fig. 2 gives a portion of one of the small fronds, not the smallest, 
and Fig. 3 represents the average of the largest forms. It shows well 
the mode of tapering toward the base of the frond, while it gives as 
much of the stipe as is seen on any of the specimens. Fig. 4 gives an 
enlarged fragment, to show the nervation. 
Genus MACROTZNIOPTERIS Schimper. 
MAcROTENIOPTERIS CALIFORNICA Fontaine. 
Pl. LIII, Fig. 1; Pl. LIV, Figs. 1, 2. 
1896. Macroteniopteris californica Font.. Am. Jour. Sci., 4th Ser., Vol. II, p. 274. 
Fronds variable in width, mostly large. The largest seen had a 
midrib 1 cm. in width and a leaf at least 15 cm. wide. Only fragments 
were seen. The smallest form had a width toward its base of only 4 
cm. The widest leaves were not entire, so that their maximum width 
1Paléontologie Francaise, 2e Série, Végétaux, Vol. I, p. 441, pl. 1xiii, figs. 1-5. 
