JURASSIC FLORA OF DOUGLAS COUNTY, OREO. 107 



forking was seen in the nerves; in the lower ones a nerve occasionally 

 forks above the point of insertion. 



PL XXIII, Fig. 1, gives a considerable portion of the upper part of a 

 leaf with obliquely placed leaflets. Fig. 2 represents a fragment of the 

 basal part of a leaf containing the basal portion of some remote, narrow 

 leaflets. Fig. 3 shows a similar part of a leaf canying the basal parts 

 of several larger and more closely placed leaflets. Fig. 4 shows two of 

 these leaflets enlarged. 



The plant is rare everywhere. It is most common at localities 

 Nos. 18 and 19. 



Ctenophyllum Wardii Fontaine. 

 PI. XXIII, Figs. 5-12. 



1896. Ctenophyllum Wardii Font.: Am. Journ. Sci., 4th ser., Vol. II, p. 274 (nomen). 

 1900. Ctenophyllum Wardii Font.: Twentieth Ann. Rep. U. S. Geol. Surv., 1898-99, 

 Ft. II, p. 357, pi. lix; pi. Ix; pi. Ixvii, fig. 5. 



A considerable number of specimens of a plant that agrees well with 

 Ctenophyllum Wardii were found at some of the Oregon localities. They 

 are very fragmentary, and do not compare with the fine specimens found 

 in the Oroville flora. Nearly all the specimens are fragments of unat- 

 tached leaflets, poorlj^ preserved. The midrib indicated on the Oregon 

 plants seems wider than that seen in the Oroville specimens, for one shows 

 a width of 5 mm. The leaflets have about the same range in width as 

 those of Oroville. The widest have a width of about 2 cm. and the nar- 

 rowest about 1 cm. The nerves are numerous, fine, and closely placed. 

 They are prominent, and not immersed in the leaf substance, but stand out 

 like threads. They fork mostly at their base, and sometimes, but rarely, 

 higher up. Some are single. Very rarely an anastomosis may be detected, 

 but it is clearly not an essential feature. 



Fig. 5 shows parts of several leaflets evidentlj^ once united to a com- 

 mon midrib, and Figs. 6 and 7 are enlargements of two of these. Fig. 8 

 includes portions of two large leaflets, probably of their middle parts. 

 Fig. 9 gives part of a small leaflet. Fig. 10 shows part of a midrib and 

 several attached fragments of leaflets shown on only one side of the midrib. 

 Fig. 11 shows a fragment of the upper part of a leaf with portions of several 

 leaflets attached. Fig. 12 is an enlargement of Fig. 11. 



It occurs at localities Xos. 1, 2, 7, 11, 17, and 19. 



