JURASSIC FLORA OF DOUGLAS COUNTY, OREO. 105 



Genus CTENOPHYLLUM Schimper. 



Ctenophyllum angustifolium Fontaine. 



PI. XXII. 



1896. CtenopTiyllum angustifolium Font.: Am. Journ. Sci., 4th ser., Vol. II, p. 274 



(nomen.). 

 1900. Cteiwphyllum angustifolium Font.: Twentieth Ann. Rep. U. S. Geol. Siirv., 



1898-99, Pt. II, p. 360, pi. Ixiii, figs. 2, 3. 



Ctenophyllum angustifolium was found for the first time in the Oroville 

 flora, in which only two imperfect specimens were seen. This fossil is 

 quite abundant in the" Oregon Jurassic flora at locality No. 2, where a 

 number of fairly good specimens were obtained. The characters made out 

 in the Oroville specimens' are seen in those from Oregon. While the latter 

 are much larger, they do not show the bases and tips of any of the leaves, 

 which still remain unknown. The leaves must have had a considerable 

 size, for fragments 8 cm. long were obtained that indicate that, without 

 the petiole, they must have been at least 15 cm. long. The leaves seem to 

 have been oblong elliptical in form, narrowing to the base and apex. 

 The axis is strong. The leaflets seem to have had a different angle of 

 attachment according to their position on the leaf. They were, in the 

 basal portion, perpendicular to the axis. In the higher parts they 

 become more and more inclined. They were usually somewhat falcate, 

 more so in the upper parts of the leaf. The leaf substance was thick and 

 dense. They are slightly expanded where the base is attached, and keep 

 their width unchanged to above the middle of the leaflet, then narrow 

 gradually to the tip. They are very narrow and linear in form. The tips 

 are obtusely rounded off. In the same position on the leaf they may vary 

 somewhat in width, a few being a little wider or narrower. Taking the 

 leaflets from the middle portions of the leaves for measurement, there is 

 some small variation in different leaves. The wddest leaflets seen did not 

 have their ends preserved. They have a width of 3 mm. The narrowest 

 leaflets are only 2 mm. wide. The longest leaflet seen, probably not 

 actually the longest, is 6 cm. long and 2 mm. wide near the base. The 

 leaflets are rather remotely placed. The nerves are slender, and not 

 easily seen without the help of a lens. They are unbranched, attached at 

 the same angle as the leaflets, and about 5 in number. 



