1 06 MESOZOIC FLORAS OF UNITED STATES. 



PL XXII, Fig. 1 shows a form with the widest leaflets; Fig. 2 gives a 

 fragment showing the greatest length of leaflets in leaves of average 

 width, and Fig. 3 a few of these enlarged a little; Fig. 4 shows a pretty 

 large fragment with leaflets of the narrowest kind; Fig. 5 includes two 

 fragments with leaflets of average width, having some irregular in size. 



The plant is quite common at locality No. 2, and occurs also at locality 

 No. 1. 



Ctenophtllum pachtnerve Fontaine n. sp. 



PI. XXIII, Figs. 1-4. 



A plant regarded as a new species of Ctenophyllum was found, with 

 several specimens, in the Oregon flora. It has some resemblance to 

 Ctenophyllum grandifolium Storrsii," but is a much smaller plant. The 

 variety Storrsii, in the description of the Oroville flora, was erroneously 

 drawn, with anastomosing nerves. The species now in question is rare, 

 and the specimens are mostly poorty preserved, but it has such a dis- 

 tinct character that it differs certainly from any previously described 

 form. The midnerve or axis of the leaves is not well shown, but seems to 

 be slender. The leaflets vary somewhat according, apparentlj^, to their 

 position on the leaves. The}^ are attached by their entire base to the sides 

 of the axis. Apparently they stand at right angles to the axis in the lower 

 portion of the leaves and are there straight. In the upper parts of the 

 leaves they are inclined to the axis at angles more acute as the ends of the 

 leaves are approached. In these positions the}' are slightly falcate. All 

 are linear in form, widest in the lower part, and narrow toward their tips, 

 having obtuse ends. In some of the specimens distortion has caused the 

 insertion of the leaflets to appear somewhat widened, which is not really 

 the case. The upper leaflets are more closely placed than the lower ones. 

 The latter are sometimes quite remote. The upper falcate leaflets are the 

 only ones showing their full length. They are 5 cm. long and 4 mm. wide. 

 The leaf substance was thick and leather-like. The most characteristic 

 feature is seen in the nerves of the leaflets. These are 5-7 in number, 

 attached under the same angle as the leaflets, mostly single and parallel to 

 one another. They are peculiarly strong and stand out like threads, 

 causing the leaflets to appear striated. In the upper falcate leaflets no 



« Twentieth Ann. Rep. U. S. Geol. Surv., Pt. II, 1900, p. 359, pi. liii, fig. 3: pi. Ixii; pi. bdii, fig. 1 : pi. Ixvi, 

 fig. 3. ■ 



