302 MESOZOIC FLORAS OF UNITED STATES. 



and consolidated with the stem. The teeth are from 5 to 10 mm. long^ 

 narrow, hnear, acute at the tips, with the margins thickened so as to 

 appear corded. The stems, in the internodes between the sheaths, are 

 striated with narrow parallel depressed lines, differing markedly in this 

 respect from the stems of E. Phillipsii, which are smooth. These 

 furrows, when reversed by a cast being taken in the fine mud, appear as 

 raised lines. The striation is due to the depressed lines between the 

 consolidated bases of the teeth, which, unlike those of E. Phillipsii, do 

 not narrow out, but persist from one sheath to another. The mode of 

 striation is shown in Fig. 12, which represents two enlarged teeth with 

 a portion of the stem at their bases. 



PI. LXXII, Fig. 12, represents a portion of a medium stem, on 

 which two sheaths are vaguely shown, one at the top. The teeth and 

 sheaths in all the specimens of this Equisetum are so closely appressed 

 to the stem that they are seen with difficulty. Nearly all the specimens 

 show casts of the true surface of the stems. Fig. 13 shows a small-sized 

 stem with several teeth well preserved in reverse. Fig. 14 is an enlarge- 

 ment of a portion of a stem with two teeth and shows the thickened or 

 corded margins of the teeth, a feature that Schenk gives in pi. i, fig. 13, 

 of Die Fossile Flora der Nordwestdeutschen Wealdenformation repre- 

 senting this Equisetum. But in Schenk's figure the cording is more 

 decided and the teeth are more strictly linear than the}' are in our 

 specimens. It is possible that these smaller stems may not belong to an 

 Equisetum different from E. Phillipsii but may be branches of that 

 plant."* 



Order LYCOPODIALES. 



Family LYCOPODIACE^. 



Gemis LYCOPODITES Brongniart. 



Ltcopodites ? MONTANENsis Fontaine n. sp. 



PI. LXXII, Figs. 1.5^ 16 



Several specimens of a small conifer occur in the Gej^ser strata 



whose proper place can not be certainly determined. The amount of 



material is too small and the specimens are not well enough preserved 



« This species was mentioned by Professor Fontaine as occurring in Mr. Weed's collections, and this state- 

 ment is made in Weed and Pirsson's paper, p. 481, but a careful examination of the specimens fails to show any 

 impressions of it sufficiently distinct for illustration. — L. F. W. 



