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 i 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 mid vein 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. Californicum 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. angulare Willd.) California. 



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

 numerous, oblong-lanceolate, the lower gradually 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. Indusmm cordato-reniform or 

 orbicular 'with a narrow sinus ; veins free. 



* Texture thin-membranous, veins simple or once forked, 

 fronds bipinnatifid. 



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



\ Lowest pinnce gradiially reduced to mere lobes. 

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



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

 stipes short, scaly below; fronds i^ 2 long, broadly lanceo- 

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



