10 THE LATEK EXTINCT FLORAS OF NORTH AMERICA. 



exhibit the fructification, an indication that this was borne on distinct fronds. 

 If it were a species of Woodwardia it is almost certain that we should have 

 found the fructification, since all the fronds of Woodwardia may be fruitful, 

 and the fructification is generally observable in the fossil species of that 

 genus. 



Since the above notes were written I have obtained a number of 

 specimens of Onoclea from the shores of Whatcom Lake, near Bellingham 

 Bay, Washington. In this vicinity there is a great development of strata 

 which are rich in fossil plants and are about the equivalents in time of the 

 Laramie group; but, with few exceptions, the forms are distinct. This is 

 one of the few which are common to the two localities. 



Varying, as the living' Onoclea does, in the size, outline, and nervation 

 of the sterile frond — from 6 inches to 3 feet in height; from a finely reticu- 

 lated to an open, dichotomous nervation; from a bipinnate frond with 

 remote, obovate pinnules, to a pinnate form with wave-margined pinnse 

 and broadly alate rachis — it plainly includes all the characters of the fossils 

 before us, and I therefore find it impossible to separate them. 



This is apparently the plant described by Prof. E. Forbes (Quart. 

 Journ. Geol. Soc. London, Vol. VII (1851), p. 103), under the name of 

 Filicites (!) hebridicus, and obtained by the Duke of Argyle from the 

 Island of Mull. It has also been met with by Professor Heer in collections 

 of fossil plants from the Eocene beds of Atanekerdluk and other places in 

 the arctic regions. (Fl. Foss. Arct, Vol. VII, p. 48, PL LXX, fig. 6.) 



Formation and locality: Tertiary (Fort Union group). Fort Union, 

 Dakota. 



Lasteea (Goniopteris) Fischeri Heer?. 



PL XL VIII, fig. 6. 



Fl. Tert. Helv. Vol. I (1855), p. 34, PI. IX, figs. 3a-3e. 



Lastrea (Goniopteris) KnigJitiana Newb. Proc. IT. S. Nat. Mus., Vol. V (March. 

 21, 1883), p. 503. 



"Frond large, tripinnate; pinnee linear, 2 centimeters wide, 14 to 16 

 centimeters long; pinnules diverging at a large angle, united for tAvo-thirds 

 of their length, upper third free, pointed, and curved upward; venation 

 clear and exact, midrib reaching the extremity of the pinnule ; the lateral 

 nerves about ten on either side, parallel, curved upward." 



