46 UNITED STATES GEOLOGICAL SUE VET— TERTIARY FLORA. 



represent a cylindrical ear of Lycopodiuin, which may be a fruiting branch 

 of this species. It is two centimeters long, three millimeters wide, and 

 seems to bear small round glomerules, like crushed sporanges of Lycopods. 

 These are, however, too indefinite in form, and could not be satisfactorily 

 represented. 



Habitat. — Near Elko Station, Utah {Prof. E. D. Cope). 



SELAGINELLA, Beauv., Spring. I 



Selaginella Bertlioudi, Lesqz. 



Plate V, Figs. 12, 12 a. 

 Selagiiiella Berthoudi, Lesqx., Annual Keport, 1873, p. 395. 



Frond dichotomous like the stems and branches, prostrate or creeping (?), slender; divisions linear, 

 at an acute angle of divergence, short ; leaves four-ranked, lateral ones spreading, distichous, linear, 

 oblong or lanceolate, pointed ; middle leaves small, oval or nearly round, entire, closely appressed to the 

 base of the longer leaves and covering it. 



This fine species, represented by very distinct specimens, seems to have 

 had, like many analogous species of the present flora, a large, diffuse frond, 

 either creeping or flattened upon the ground. All its divisions are dichoto- 

 mous and apparently on the same acute angle of divergence of 40° to 50°; the 

 ultimate ones are short, linear, obtuse or truncate, one to two centimeters long, 

 four millimeters wide. The leaves are in two rows, the lateral ones open 

 distichous, imbricated by the lower side, longer, oblong, lanceolate-acute, 

 sessile, and distinctly nerved in the middle; the intermediate ones, much 

 smaller, scarcely one millimeter long and half as broad, are of about the same 

 form, oval, obtusely pointed, and marked also by a middle nerve. All the 

 leaves are entire, alternate, and thickish, not pellucid, their surface being 

 generally covered by a thin pellicle of coaly matter. This plant, in ils char- 

 ter, greatly resembles some of the present species of this genus inhabiting 

 subtropical regions, like S. sfolonifera, S. Mertensii, etc. 



Habitat. — Golden, Colorado {Capt. Ed. Berthoud), to whom this fine 

 species is justly dedicated. 



Selag^inella fa I c a t a , Lesqx. 

 Plate LXI, Figs. 12-15 ; Plate LXIV, Figs. 13, 13 a. 

 Selaginella falcata, Lesqx., Annual Keport, 1874, p. 297. 



Primary stem thick, round, dichotomous ; pinnae narrow, linear ; leaves close, two-ranked, distichous, 

 sessile, open, generally covering each other at the borders, entire, lanceolate-pointed, narrowed at their 

 point of attachment to a slender racbis, membranaceous, pellucid, without any middle nerve. 



Though the stem, plate Ixiv, fig. 13, was not found connected with any 

 fragment of branches, the leaves which cover it all around, imbricating at 



