PLANTS FROM ALASKA. 1^V^ 



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

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

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

 timate pinnse, as given in PI. XLI, Fig. 1. which i^rohahly belong to the 

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

 to ovate olilong. They are slightly falcate and have lancet-shajjed, 

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

 shghtly fonvard toward the ends of the ultimate pinnte. They are united 

 at base by a decurrence of their dorsal bases. The lower pinnul(\s of 

 lowei' ultimate pinna^ are least united. Toward the ends of tlie ultimate 

 pinna' 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, 8. 



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

 an upper ultimate pinna where the })innules are more united and reduced 

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

 shape of one of the larger pinnules. -""i] 



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

 distance to the end of the pinnule splits up into t)ranches after the fashion 

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

 and in the absence of fructification must l)e placed in it. The latei-al 

 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 verv ol)liquely and are forked one or more times. The lowest are the 

 most copiously l)ranched. The forking is notal)ly 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 oft" from the main rachis. 

 In the more separated pinnules the lower lateral nerves curve away 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 compountl pinna' found by ]\Ir. 

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

 Mr. Woolfe found two rock fi-agments, 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 cany as subor- 



