GEOLOGICAL SURVEY OF THE TERRITORIES. 385 



Carl}on Station, ^Vyoming Territory. 



The specimens obtained at Carbon are from the same limited area, 

 but from two different levels. In order to mark difference of vegetation 

 according to horizontal station, these specimens are described separately. 



1st. From below the main coal,* in a soft-grained, very hard shale, 

 irregularly breaking by cleavage, but where the vegetable remains are 

 distinctly preserved, some of them are of large size. 



Equisetum Haydenii, Lsqx., Eept. 1871, p. 284. 



The specimens represent some rootlets and tubercles of this species. 

 One of the tubercles split lengthwise in the middle exposes a central 

 solid axis 1} mill, thick, while the parietes or intervals from the axis to 

 the borders, 4 mill, each side, appear formed of a spongy though com- 

 X)act cellular tissue, hecoming more compact and darker-colored near 

 the borders. A cross-section of another tubercle shows it to be oval or 

 somewhat flattened by compression, 12 mill, in one direction and only 9 

 mill, in the other. Another specimen has a linear rootlet or stem 

 whose main axis is 4 mill, wide, ai)parently central, and surrounded by 

 cellular tissue of equal thickness. It is marked by distant nodi witk 

 round scars of the same form as those of Equisetum Haydenii, and is 

 referable to this species. 



Smilax grandifolta, Uug., Chi. PI. XL, Fig. 3. 



The leaf which I refer to this species is of the same size as the one 

 figured by Unger in the Sillog., PI. II, Fig. 8 ; but it has only 7 basilar 

 veins, while TJnger's leaf has 9. The same form as ours is published by 

 Heer in Fl. Tert. Helv., PL XXX, Fig. 8 and Sh. A variable species, 



AcoEUS EEACHYSTACHYS, Heer. 



Exactly the same form as described in Eept. 1871, i>. 288, from Cres- 

 ton. It is represented by three specimens which merely differ from the 

 Spitzberg ones by shorter and broader spadices, 5 mill, broad, 7 mill, 

 long, with only four rows of flowers or ovaries ,• the stem, too, is nar- 

 rower, scarcely 5 mill, broad. 



Caulinites spakganioides, s2). nov. 



Described with better specimens from Black Butte. 



POPULUS AkcTiGA, Heer, Arct. Fl., p. 100, &c. 



This species is represented at Carbon in most of its numerous varie- 

 ties, with nearly round and entire leaves, or with undulate or more or 

 less crenate borders, &c. They positively prove that the leaves named 

 Populus suhrotimda, Lsqx., in Am. Jour. Sci. and Arts, 1868, p. 205, as 

 also those described as P. Nebrascensis, Xewb., in Xotes on extinct 

 floras, p. 62, belong to this species. 



POPULL'S DECIPIENS, SJ). nOV. 



Leaves broadly rhomboidal or round, enlarged in the middle, abruptly 

 narrowed into a very obtuse point, rounded or broadly wedge form to 



* See section of Carbon in first part of this report. 

 25 G S 



