114 MESOZOIC FLORAS OF rXFIFD STATES. 



have 1)0011 very larjio. A fragment was obtained 15 em. long, and this 

 was evidently but a small part of the leaf, for the axis shows no diminu- 

 tion throughout its length. The fragments of several leaves are com- 

 monly found together, indicating that they were associated in growth. 

 The leaflets in the upper part of the leaves seem to have ijeen more 

 closely placed, and to l)e proportionally wider than those in the lower 

 part. The leaves had a petiole of consideral)le length. The widest 

 axis seen is about 6 mm. in width. The longest leaflets obtained are 

 10 cm. long. They show no diminution in width and are e\idently 

 much shorter than the entire leaflet. There is not much variation in 

 the width of the leaflets. The widest are 10 mm. in widtli and the 

 narrowest are 6 mm. The Oregon specimens have suffered much from 

 the creep of the rock which contains them. This has taken place along 

 the plane of the leaves and left them polished and much puckered and 

 distorted. The wrinkles sometimes resemble reticulated nerves. The 

 leaflets are widest at base and are deciirrent. They are attached l)y the 

 entire base and curve strongly away from the axis. They are strap- 

 shaped. The nerves are sharply defined, but slender, and are immersed 

 in the leaf substance, which is comparatively thin. They are approxi- 

 mately parallel and do not anastomose so copiousl_y as Zigno represents 

 them. The magnified figure of Lindley and Hutton" gives much more 

 nearly the reticulation as seen in the Oregon forms. They run jiarallel 

 for long distances, sending off short branches that imite very oliliciuely 

 with the adjacent nerves. The anastomosis takes place at pretty regular 

 intervals, first at the base of the leaflets, then higher up, at intervals of 

 a little less than 10 mm. 



PI. XXV, Fig. 9, shows portions of three leaves, two with petioles, 

 and all so placed as to indicate that they were associated in growth. 

 PI. XXVI, Fig. 1, shows the largest specimen found, which is apparently 

 the middle part of a leaf. This is shown enlarged in Fig. 2. It is much 

 distorted. Fig. 3 gives portions of two leaves, with broad leaflets. 

 Fig. 4 shows a portion of the upper part of a leaf with wide leaflets. 

 Fig. 5 shows a fragment of a leaf with the narrowest leaflets found. 

 They are shown enlarged in Fig. 6. 



The plant is abundant at locality No. 19, and occurs rarely at locali- 

 ties Nos. 1, 2, 3, 7, and 17. 



" Foss. Fl. Gt. Brit., Vol. II, pp. 63-64, pi. ciii. 



