112 OUR NATIVE FERNS AND THEIR ALLIES. 



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

 fornia. 



7. A. aculeatum Swz. Rootstock stout, erect ; 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 midvein than the 

 edge. California, Mt. Peddo, Washington Territory (Suksdorf). 



Var. Californicum D.C.Eaton. 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. angulare D. C. Eaton. Fronds oblong-lanceolate, 

 scarcely or not at all narrowed at the base, fully bipinnate ; pin- 

 nules distinctly short-stalked, mostly auricled and slightly in- 

 cised ; the basal one largest and again pinnatifid; under sur- 

 face chaffy-fibrillose. {A. angulare Willd.) California. 



Var. Braunii Koch. Fronds oblong-lanceolate ; pinnae nu- 

 merous, 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. NEPNRODIUM Rich. Indiisium cordato-reniform or 

 orbicular with a narrow sinus ; veins free. 



* Texture tJiin-iiicmbranous, veins simple or once forked, 

 fronds bipinnatifid. 



^ t Lowest pinnce gradually reduced to mere lobes. 



8. A. Noveboracense Swz. Rootstock slender, creep- 

 ing; fronds i 2 long, 4' 6' broad, lanceolate, tapering both 

 ways from the middle ; pinnae lanceolate, the two or more lowest 



