THE FLORA. 



113 



quently determined to belong to the Vermejo 

 formation of the Montana group. It is re- 

 corded from the Laramie at Marshall, Colo., 

 by Cockerell, who says : 



Pound first at Marshall by Paul Haworth. Our speci- 

 mens run a little larger than Hollick's but appear to be 

 otherwise quite identical; the pinnules are entire. The 

 plant may possibly be a variety of Anemia toydenii 

 (Gymnogramma haydenii Lesquereux, 1872), which appears 

 to be distinctly different from A. subcretacea (Saporta) 

 Gardner and Ettingshausen as originally figured by 

 Saporta. 



I have not seen the material mentioned by 

 Cockerell, nor has Anemia been noted in any 

 of the collections from Marshall and vicinity 

 that have passed through my hands, though I 

 have no reason to doubt the above determina- 

 tion. 



Occurrence: Vermejo formation, Florence, 

 Colo, (type); Laramie formation, Marshall, 

 Colo., reported by Prof. T. D. A. Cockerell. 



Anemia sp. 



Plate II, figure 1. 



Anemia sp. Knowlton [nomen], U. S. Geol. Survey Bull. 

 696, p. 75, 1919. 



In the material from a locality a few miles 

 north of Colorado Springs there is a single frag- 

 ment of the pinnule of an Anemia. The mat- 

 rix on which it is preserved is so coarse grained 

 that only the outline can be made out with cer- 

 tainty. The nervation appears to consist of 

 slender veins at a rather acute angle, but their 

 manner of forking can not be seen. 



This fragment is very readily comparable 

 with various species of Anemia, especially 

 Anemia subcretacea, but it is so poorly pre- 

 served and so small that it is best left without 

 speculation as to its specific identification. 



Occurrence: Laramie formation, opposite 

 sand-lime brick works about 4 miles north of 

 Colorado Springs, Colo., collected by A. C. 

 Peale and G. I. Finlay, 1908. 



Lygodium? compactum Lesquereux. 



Plate I, figure 1 (type). 



Lygodium compactum Lesquereux, Am. Jour. Sci., 2d ser., 

 vol. 16, p. 206, 1868; U. S. Geol. and Geog. Survey 

 Terr. Ann. Rept. for 1869, p. 196 [reprint, 1875]; 

 idem for 1873, p. 380, 1874; idem for 1876, p. 498, 

 1878; Tertiary flora: U. S. Geol. Survey Terr. 

 Bept., vol. 7, p. 64, pi. 5, fig. 9, 1878. [Lesque- 

 reux's figure of the type is here reproduced.] 



The type and so far as known the only speci- 

 men ever obtained of this species is No. 118 of 

 the fossil-plant collections of the United States 

 National Museum. It is a small fragment 

 preserved on a piece of hard, rather coarse- 

 grained sandstone, and is very obscure. 



There is much uncertainty as to the proper 

 disposition of this specimen. It is so frag- 

 mentary and its nervation is so poorly pre- 

 served that a satisfactory characterization of 

 it is impossible. There is even some doubt as 

 to whether it is a fern. But in the absence of 

 additional specimens or further information 

 concerning the type, it is retained as left by 

 its author, in the hope that future exploration 

 inay clear up its position, though at present it 

 is not of much value. 



Occurrence: Laramie formation, Marshall 

 mine, Marshall, Colo., original collection of 

 F. V. Hayden. 



Order E QTJISETALE S . 



Family EQUISETACEAE. 



Equisetum perlaevigatum Cockerell. 



Plate I, figures 8, 9. 



Equisetum perlaevigatum Cockerell, West Am. Scientist, 

 vol. 6, p. 154, 1889. 



Equisetum laevigatum Lesquereux, TJ. S. Geol. and Ceog. 

 Survey Terr. Ann. Rept. for 1873, p. 395, 1874; 

 idem for 1876, p. 498, 1878; Tertiary flora: U. S. 

 Geol. Survey Terr. Rept., vol. 7, p. 68, pi. 6, 

 figs. 6, 7, 1878. [Lesquereux's original figures are 

 here reproduced.] [Homonym, Al. Braun, 1867.] 



This so-called species is a very unsatisfactory 

 one indeed. The material upon which it is 

 founded is preserved in the United States 

 National Museum (Nos. 42, 43) and represents, 

 so far as known, all that has ever been found. 

 The larger specimen (original of Lesquereux's 

 fig. 7), from Sand Creek, Colo., is very obscure 

 and has more the appearance of a piece of 

 dicotyledonous bark, or the impression of a 

 stem. Its surface is wrinkled irregularly 

 rather than striately, and the so-called tuber- 

 cles can hardly be made out. As a factor in 

 the distribution of the species this specimen 

 can safely be ignored. 



The smaller specimen (original of Lesque- 

 reux's fig. 6), from the hard white sandstone at 

 Golden, Colo., is without doubt a portion of 

 the underground stem of an Equisetum, but it 



