FLORA OF THE KOOTANIE FORMATION. 289 



and a thick, apparently coriaceous leaf substance that leaves a film 

 of carbon on the rock. The fertile specimens are such as we should 

 expect to be found if the sterile pinnule depicted in PL LXXI, Fig. 5, 

 underwent such modifications as are found in the fertile pinnules of a 

 Dicksonia. The two fertile portions of pinnules given in PI. LXXI, 

 Figs. 7 and 9, differ decidedly from the fertile pinnules of D. monta- 

 nensis, and this fact has induced me to make, but 'with doubt, a new 

 species of these forms. The material is much too imperfect and scanty 

 to permit their proper place to be determined with any degree of 

 positiveness." 



The form given in PL LXXI, Fig. 7, differs somewhat from that 

 shown in Fig. 9, but the difference is of the same nature as that shown 

 in the two fertile forms of Dicksonia montanensis; that is, the form 

 shown in Fig. 7 is more modified and less foliaceous than that given 

 in Fig. 9. 



The sterile form depicted in PL LXXI, Fig. 5, is the fragmental 

 terminal portion of what must have been a rather large pinnule. It 

 reminds one somewhat, in size and nervation, of the sterile pinnules 

 of the living Dicksonia sorbifolia Smith; only the terminal portion of 

 the pinnule is preserved to such an extent as to give some idea of its 

 shape. The lamina on the left side of the lower part of it is wholly 

 wanting, and on the corresponding right-hand portion the margin is 

 gone, so that we can not determine whether or not the lower portion 

 of the pinnule had dentate margins like the upper portion. It prob- 

 ably had. 



The lateral nerves are strong and in all parts of the pinnule fork 

 near their departure from the midrib. In the lower part of the pin- 

 nule not enough is shown to disclose certainly the entire course of these 

 nerves, but one, on both of the branches, apparently forks again. In 

 the terminal toothed portion there is no second forking and each branch 

 tex'minates in a tooth, as is shown in the magnified portion, PL LXXI, 

 Fig. 6. 



The fragment represented in PL LXXI, Figs. 7 and 8, is a small 

 bit of a fertile pinnule with relatively laree sori, placed close to the 



" Better material was obtained from the Shasta formation described later by Professor Fontaine, but inserted 

 earlier in this paper. — L. F. W. 



MON XLVIII — 0.5 19 



