PLANTS FROM ALASKA. 155 



I^laylvim FTERIDOFH YT^ (Feinas and Fern 



Allies). 



Order FILICALES (Ferns). 



Family CYATHEACE^. 



Genus DICKSONIA L'Heritier. 



DiCKSONiA Saportana Heer. 



PI. XXXIX, Figs. 1, 2. 



1876. Dicksonia Safortana Heer: Fl. Foss. Arct., Vol. IV, Pt. II (Jura-Fl. 



Ostsibiriens und d. Amurlandes), p. 89, pi. xvii, figs. 1, Ic, 2, 2b; pi. xviii, 



figs. 1, lb, 2, 3. 

 1888. AspleniumDiclcsonianum'H.eev. Lesquereux: Proc. U. S. Nat. Mus., Vol. XI, 



p. .32, Cat. U. S. Nat. Mus., No. 243.5. 



On a small fragment of rock collected by Mr. Woolfe there is an 

 imprint of a fern that agrees well with Dicksonia Saportana as determined 

 by Heer from the Jurassic of Siberia. Indeed, in form and size of the 

 pinnules and in the rather uncommon nervation this fossil is exactly like 

 fig. 2 of pi. xvii of Heer's work. The specimen shows a portion of a 

 penultimate pinna with a number of ultimate ones, in which the termina- 

 tions are wanting. Most of the pinnules are more or less lacerated, and 

 this probably caused Lesquereux to make an erroneous determination of 

 the plant. He regarded it as Asplenium dicksonianum Heer. The entire 

 pinnules, however, have no resemblance to this plant. Only one 

 specimen was found. 



PI. XXXIX, Fig. 1, gives the fragment, and Fig. 2 a pinnule mag- 

 nified. 



Famil.v POLYPODIACE^. 



Onnus ONYCHIOPSIS Yokoyama. 



Ontchiopsis psilotoides (Stokes & Webb) Ward n. comb. 



PI. XXXIX, Figs. 3-6. 



1824. Hymenopteris psilotoides Stokes & Webb: Trans. Geol. Soc. London, 2d ser., 



Vol. I, p. 424, pl. xlvi, fig. 7; pi. xlvii, fig. 2. 

 1827, SpJienopteris Mantelli Brongniart in Mantell: Illustrations of the Geologj^ of 



Sussex [revised edition], p. .55. 

 1836. Cheilanthites Mantellii (Brongn.) Gopp.: Syst. Fil. Foss., p. 231. 



