FOSSIL FLORA. 675 



EQUISETUM LESQUEREUX1I Kll. 



Equisetum lesquereuxii Ku.: Bull. U. S. Geol. Surv. No. 152, p. 94, 1S98. 

 Equisetum limosum Linn. Lesquereux: Fifth Ann. Rept. U. S. Geol. and Geog. Surv. 

 Terr., 1871 (1872), p. 299; Tert. Fl., p. 69, PL VI, fig. 5. 



As already stated under E. hagnei, the type specimen of this species is 

 in the United States National Museum (No. 41). The figure given in Tert. 

 Fl. (PI. VI, fig. 5) is much more perfect than the specimen proves to be. 

 The figure shows 7 ribs and the same number of teeth, which would make 

 at least 14 ribs for the whole stem. The specimen shows only 4 or 5 ribs, 

 and the sheaths and teeth are very obscure. 



As it seems very unlikely that it should belong to the living species, 

 I have ventured to change it, and have named it in honor of Professor 

 Lesquereux. 



Habitat: "Near Yellowstone Lake, among basaltic rocks." 



Equisetum canalioulatum n. sp. 

 PI. LXXXI, figs. 6, 7. 



Stem larg-e, about 50-ribbed; articulate; articulation long; sheath 

 obscure, but apparently short; teeth numerous, short- appressed, sharp- 

 pointed. 



This species is represented by the two fragments figured and a number 

 of other doubtful ones, which are hardly enough to properly characterize 

 the species; but they seem to differ from all described species likely to 

 occur in this region, and I have ventured to give them a new name. 

 More perfect material may bring out the relationship. 



The longest stem (fig 6) is about 6 cm. in length, and the broadest 

 on that piece of material is 13 mm. The other specimen (fig. 7) is 5 cm. 

 long and 21 mm. broad. The ribs are distinct, yet not specially strong. 

 They number, as nearly as can be made out, about 25 on a side, or 

 approximately 50 for the entire diameter. The length of the segments can 

 not be made out. The sheath is also obscure. It may be that fig. 6 repre- 

 sents a single sheath; if so, it is long, but the other specimen gives slight 

 evidence of having a short sheath. The teeth are short and appressed and 

 end in slender points. As near as can be made out, there are about 25 

 teeth in view, or something like 50 for the whole stem. 



