112 OUR NATIVE FERNS AND THEIR ALLIES. 



compressed, scaly ; veins close, immersed ; sori copious. Cali- 

 fornia to Washington. 



7. D. aculeata (L.) Ktze. Rootstock stout ; stipes vari- 

 able in length, very chaffy with large and small scales inter- 

 mixed as in the rachis; fronds 1° — 2° long, growing in a crown, 

 oblong-lanceolate, pinnate; pinnae closely placed, lanceolate 

 from a broad base, mostly curved upwards, incisely pinnatifid or 

 again pinnate; segments or pinnules of variable shape, oval- 

 rhomboidal, or unequally triangular-ovate and auriculate on the 

 upper side of the slightly stalked base, the teeth aculeate in 

 various degrees; under surface more or less chaffy-fibrillose ; 

 sori in two rows, on the segments nearer the midvein than the 

 edge. California, Mt. Peddo, Washington {Suksdorf). 



Var. Californica (Eat.) Unde. Fronds elongate, narrow, 

 tapering slightly at the base ; pinnae but slightly incised above 

 the middle, more and more deeply cleft toward the rachis, the 

 lower superior segment largest, but scarcely distinct as a pin- 

 nule, and not at all auricled. {A. CaViforiiicuin D. C. Eaton.) 

 California. 



Var. angularis (Willd.) Unde. Fronds lanceolate, scarcely 

 or not at all narrowed at the base, fully bipinnate ; pinnules dis- 

 tinctly short-stalked, mostly auricled and slightly incised ; the 

 basal one largest and again pinnatifid; under surface chaffy- 

 fibrillose. {A. angnlare Willd.) California. 



Var. Braunii (Spenner) Unde. Fronds lanceolate; pinnae 

 numerous, oblono-lanceolate, the lower ^raduallv reduced in 

 size and obtuse; pinnules ovate or oblong, truncate and almost 

 rectangular at the base, sharply toothed, beset with long soft 

 hairs as well as chaffy ones. {A. Braunii Spenner.) Maine to 

 New York and northward. 



§ 4. Nephrodium Rich. Ifufus/uin cordato-rem'form or 

 orbicular luilh a narrow sinus ; veins free. 



* Te.xtnre i hin-membranoiis, veins simple or once forked, 

 fronds bifiinnatifid, 



* Fronds thin-membranous ; veins simple or once forked. 



t Lowest pinncE gradually reduced to mere lobes. 



I Fronds in a crown from a stout, creeping rootstock. 



8. D. montana (Vogl.) Ktze. Rootstock oblique, scaly • 

 stipes short, scaly below; fronds \\° — 2'' long, broadly lanceo- 

 late, tapering below, glandular; pinnae 2' — 3' long, deeply pin- 



