688 FILICES. (FERNS.) 



-t- --- Large (2-4 high) ; fronds once pinnate and the pinnce deeply phina'i- 

 Jid, or nearly twice pinnate ; fruit-dots not very near the margin ; the indu- 

 sium large, thinnish and flat, persistent. 



6. A. cristaturn, Swartz. Frond linear-oblong or lanceolate in outline 

 (1 -2 long) ; piiuut' short (2-3' long), triangular-oblong, or the lowest nearly 

 triangular-ovate, from a somewhat heart-shaped base, acute, deeply pinnatifid ; 

 the divisions (6- 10 pairs) oblong, very obtuse, finely serrate or cut-toothed, the 

 lowest pinnatifid-lobed ; fruit-dots as near the mid rein as the margin ; indusium 

 round-reniform, the sinus mostly shallow, smooth and naked. Swamps, etc. ; 

 common. Julv. Stipes and the stout creeping rootstock bearing broad and 

 deciduous chaffy scales. (Eu.) 



Var. Clintonianum. Frond in every way much larger (2^-4 long), 

 pinnae oblong-lanceolate, broadest at base (4- 6' long, 1-2' broad), deeply pin- 

 natifid ; the dii-iniuns (8-16 pairs) crowded or distant, linear-oblong, obtuse, 

 obscurely serrate or cut-toothed, the basal sometimes piunately lobed ; veins 

 pinnately forking, the lowest anterior veinlets bearing the fruit-dots near the 

 midvein ; iudusium orbicular with a shallow sinus, smooth and naked. 

 Swampy woods, New Eng. to N. J., N. Y. (G. W. Clinton, etc.), and west- 

 ward. Julv. Rootstock stout, creeping, chaffy (like the stipes) with large 

 bright-brown scales. A showy fern, unlike any European form of A. crista- 

 tum, and often mistaken for A. Goldianum. 



7. A. Goldianum, Hook. Frond broadly ovate, or the fertile ovate- 

 oblong in outline (2 -3 long); pinna; (6 -9' long), oblong-lanceolate, broad- 

 est in the mid die, pinnately parted; the din'simis (about 20 pairs) oblong-linear, 

 slightly scythe-shaped (9 - 15" long), serrate with appressed teeth; veins pin- 

 natelv forking .and bearing the fruit-dots reri/ near the midrein ; indusium very 

 large, orbicular with a deep narrow sinus, smooth and without marginal 

 glands. Rich and moist woods, from Conn, to Ky., and northward. July. 



- A stately fern, often 4 high, the fronds growing in a circle from a stout 

 ascending chaffy rootstock, and decaying in autumn. Iudusium with the 

 sides of the sinus often overlapping, thus appearing to be round and entire as 

 in Polystichum. 



t- -4- -i- -i- Large (1 -3 high) ; stipes very chaffy at base; fronds twice pinnate, 

 but the upper pinnules confluent, some of the lower pinnatiji d-toothed ; fruit- 

 dots rather large; indusium convex, ivithout marginal glands, persistent. 



8. A. Filix-mas, Swartz. Frond lanceolate in outline (1-3 high); 

 pinnae linear-lanceolate, tapering from base to apex ; pinnules oblong, very 

 obtuse, serrate at the apex and obscurely so at the sides, the basal incisely 

 lobed, distinct, the upper confluent ; fruit-dots nearer the midvein than the 

 margin, and usually confined to the lower half of each fertile pinnule. 

 Rocky woods, N. Mich, to Dak. and Col. Frond thickish but not surviving 

 the winter. (Eu.) 



9. A. marginale, Swartz. (PI. 19, fig. 1,2.) Frond evergreen, smooth, 

 thickish and almost coriaceous, ovate-oblong in outline (1-2 long); pinnae 

 lanceolate, acuminate, slightly broadest above the base ; pinnules oblong or 

 oblong-scythe-shaped, crowded, obtuse or pointed, entire or crenately -toothed ; 

 fruit-dots close to the margin. Rocky hillsides in rich woods; common, es- 

 pecially northward. Aug. 



