PLANTS FROM ALASKA. 163 



are, give a false idea of their original shape and true appearance. The 

 magnified figures of the pinnules and lobes, PI. XLI, Figs. 4, 5, are 

 slightly restored, so as to give the undistorted forms. In the large penul- 

 timate pinnae, as given in PI. XLI, Fig. 1, which probably belong to the 

 middle portion of the frond, the true shape of the larger pinnules is ovate 

 to ovate oblong. They are slightly falcate and have lancet-shaped, 

 subacute to acute tips. They are set obliquely on the rachis and point 

 slightly forward toward the ends of the ultimate pinnae. They are united 

 at base by a decurrence of their dorsal bases. The lower pinnules of 

 lower ultimate pinnae are least united. Toward the ends of the ultimate 

 pinnae and in the terminal portions of the compound ones they are more 

 and more united and pass into lobes and teeth, the size being at the 

 same time diminished. They are shown enlarged in PI. XLI, Figs. 2, 3. 



PL XLI, Fig. 5, shows, slightly magnified and restored, a portion of 

 an upper ultimate pinna where the pinnules are more united and reduced 

 to lobes. Fig. 4, also slightly magnified and restored, gives the true 

 shape of one of the larger pinnules. 



The midnerve goes off very obliquely, and at about two-thirds of the 

 distance to the end of the pinnule splits up into branches after the fashion 

 of Cladophlebis, so that the plant is a well-marked type of that genus, 

 and in the absence of fructification must be placed in it. The lateral 

 nerves, in proportion to the size of the pinnules, are quite slender. They 

 are immersed in the leaf substance and are not conspicuous. They go 

 off very obliquely and are forked one or more times. The lowest are the 

 most copiously branched. The forking is notably low down on the nerve, 

 so that the branches are unusually long. On the lower side of the base 

 of the pinnules one or more lateral nerves go off from the main rachis. 

 In the more separated pinnules the lower lateral nerves curve awa^^ from 

 the midnerve, but in the lobed and dentate forms the interior basal ones 

 often curve inward toward it. 



This description applies to the large compound pinnae found by Mr. 

 Dumars, which probably come from the middle portion of the frond. 

 Mr. Woolfe found two rock fragments, the ones examined by Lesquereux, 

 that show parts that probably belong to different positions on the frond. 

 One of them, given in PI. XLII, Fig. 1, is apparently a more terminal 

 portion of a principal pinna, which, lower down, would carry as subor- 



