365 



poiut, aud divaricate. The substance appears tliin, membrauaceous, and 

 yellowish. 

 Habitat.— Poiut of Eocks, Br. F. V. Ray den. 



3. SELAaiNELLA ? FALGATA, sp. UOV. 



Frond small, dichotomous; pinute narrow-linear, one to four centime- 

 ters long, six to seven millimeters broad ; pinnules close, two-ranked, in 

 right angle to the rachis, generally covering each other at the borders, 

 falcate upwards, lanceolate-acuminate, suddenly narrowed to the point 

 of attachment, without distinct middle nerve. 



1 have figured four different parts of this plant, which is abundantly 

 scattered among the floating rootlets and upon the specimens of the 

 Leinnal described above. It may represent some kind of floating fern 

 perhaps, rather than a species of JSelaginella. It is, however, closely 

 allied to Selaginella BertJiotidi, Lsqx., described in Dr. Hayden's Annual 

 Report for 1873 (p. 395), diifering, however, by the two-ranked [josition 

 of the leaves and their distinctly falcate form. 



Habitat. — Point of Eocks, Br. F. V. Hayden. 



4. Sequoia beevifolia, Heer. 



Branches flexuous ; branch lets opposite or alternate, open and diverg- 

 ing near the base, then curving upward and erect from the middle to 

 the top. Leaves of two kinds, either small, short, scaliform at the base 

 of the branchlets and covering the whole of tbera when young, or oblong, 

 enlarged in the middle, obtuse or abruptly narrowed to a point, and 

 gradually and slightly so toward the decurring base, distichous, oblique, 

 decreasing in length toward the base and the top of the branchlets. 

 AYe have a large branch* and numerous more fragmentary specimens of 

 this fine species described by Heer in Flor. Arct. (p. 93, PL II, fig. 23), 

 from Greenland specimens, in Flor. Spitz, (p. 37, PI. IV, figs. 2-3), from 

 Spitzbergen specimens, and formerly in Fl. Baltica(p. 21, PI. Ill, fig. 10.) 

 It is well characterized by the form of its generally short open dis- 

 tichous leaves, either abruptly pointed, or obtuse, deeply nerved, and 

 slightly decreasing in width from above the middle to the base. We 

 have, however, a number of specimens with somewhat narrower, nearly 

 linear, longer leaves, which show a notable deviation of the normal form. 

 The cone of this species is not known as yet. One of the specimens bear- 

 ing scattered branchlets and leaves of this Sequoia has a cone, which 

 appears to be a flattened cross-section, or perhaps the flattened base of 

 the cone turned upward, the pedicel marking the central point around 

 which the scales, oblong, cuneate narrow emarginate at the top, are im- 

 bricated to the borders. These scales rather resemble those of a Glyp- 

 tostrobus than those of a Sequoia. 



Habitat.— Poiut of Eocks, Br. F. V. Hayden. 



5. Sequoia longifolia, Lsqx., MSS. 



Branches thick ; leaves closely appressed, erect, long linear lanceolate- 

 pointed or accuminate, enlarged above the slightly contracted and decur- 

 ring base ; scars deep, lingulate-poiuted. marked by a deep groove in the 

 middle. 



This species was already described from Black Butte specimens ; these 

 bave, some of them at least, leaves longer than those of Black Butte. In 

 these, the leaves average two and a half to three centimeters long and 

 three millimeters wide ; in those of Poiut of Eocks, the leaves, of the same 



* a beautiful specimen, the property of Mr. E. H. Clarke, agent of the Union Pacific 

 Eailroacl, who kindly lent it for illustration of the species. 



