FLORA OF TITF KOOTAXIF FOiaFVTION. 'MH 



node iK'lon^iufl to one of the lai-jiest sizinl stems. The stem li;is Ikmmi 

 eonipressed Rxiall>- in such a maimer as to cai-iA' a\va>- the diaphrajim 

 and split down tlie sheath, so as to se|)arate the lower portions of the 

 teeth thai had i)een united to form th(> sheatli. The teeth thus appeal' 

 abnormally long. Their laneet shape is \v(>ll shown in the uppei' |>oition 

 of some which are preserved entire. I'ijr. S shows a node l)earin<!; se\eral 

 more or less perfect teeth. One of tluMu is peifectl\- pi'esei'\('d. sliowinfi 

 the full size and shape. I'ijj. \) shows two of tlie.se teeth eiiLujicd two 

 diameters. This shows well also the depressions between the teeth in 

 the .sheath. Fig. 10 gives a restoration of several of the teeth and a 

 portion of the sheath, nuich enlarged, to show details visible distinctly 

 only with the helj) of a lens. 



In my jjri^liminary repoi't on Mr. Weed's collection, mentioned 

 above, an KquiscMum is noticed, and as it was thought to be probably 

 new, tlie provisional name J'J. inontancnsc was suggested for it. The 

 numerous well-preserved im])ressions of this plant in the collection made 

 bv Professor Ward show that this is E. Pliillij)sii. This specimen is 

 represented in PI. LXXII, Fig. 11. 



p^qrisETUM Lyellii Miintcll. 

 I'l. FXXTI. Fijjs. 1_'-14. 



1833. Equisetum LyeJJii Mant.: (icoloiiy of tlic Southoast of England. ])]). 217. 227, 



245, fig. o2 (I, 2, 3) Dii p. 24.5 (iiuinlHTcd on i>. 399). 

 1S43. Kquisetitefi Lyellii (Mant.) Morr. : Catalogue of British Fossils, j). S. 

 1898. Equisetum Lyellii Mant. Font, in Wood A: Pirsson: Eiglitccnth Ann. licp. 



U. S. Geo!. Surv,. lS9r, 97, Ft. TIT, p. 4S1. 



Along with the numerous imprints of Equisetum Phillijisii tliei-e 

 occur, much more rarely, imprints and fragments of the stems of a 

 smaller Equisetum. Its character is .so constantly different fi'om that 

 of E. PhiUipsii that it can be distinguished at a glance. It agrees so 

 well with E. Lijellii, as described by Sclienk," that it must be considered 

 as identical with that Wealden species. The larger stems are about 8 

 mm. in width. They are not well enough preserved to show with c(>r- 

 tainty all the character of the plant. The nodes seen are 2 cm. long. 

 The sheaths are apparently about 1 cm. in length, closely appressed to 



" Die Fo.ss. Flor. der Nonhvcsld.'iitsili. Wi-nldciifcinimlion, p. ."). |il. i. Iii;s. 10--1.'? (Palapontofrrapliicii, Vol. 

 XrX, p. 207, pi. xxii, figs. lO-K?). 



