578 CRYPTOGAMIA F1LICE9 



Fronds slender, IS inches to 2 feet long, and 3 to 4 or 5 inches wide, in iheir 

 outline linear-lanceolate, acuminate, pinnate, smoothish,— the leaflets sub-oppo- 

 *itc, or often alternate, especially the upper ones, an inch and half to near o 

 inches long, and half an inch to an inch and quarter wide at base (the lower ones 

 shorter, wider, and subcordate at base), oblong-lanceolate, pinnatifid, deep green, 

 generally distinct and somewhat petiolate, the upper ones sepsile and confluent 

 (the terminal ones merely serrate),— the lower ones triangular or deltoid-ovate, 

 on peliole8 2or3 lines long, deeply pinnatifid ; segment* of the lower leaflets 

 oblong, obtuse, those of the upper leaflets obliquely triangular-ovate,— all incised* 

 dentate at apex, the segments gradually diminishing to mere double serratures in 

 the terminal leaflets, or pinnae ; rachis smooth, or slightly chaffy ; stipe 8 to 12 

 inches long, rather slender, and channelled above, pale greenish-straw-color, 

 smoothish, or often somewhat clothed with a tawny membranaceous chaff. Son 

 middle-sized, distinct, dark brown, mostly in 2 rows on the segments, and gener- 

 ally confined to the leaflets forming the upper half of the frond ; indtmum orbic- 

 ular-reniform. 

 J lab. Moist woodlands ; West Chester: not very common. Ft. July. 



06s. 1 have not had an opportunity to compare this with an authentic specimen ; 

 but, judging from the descriptions in the books, I think it must be the A. luncax- 

 Itirjisc— and possibly it may bo only at?ar. of A. cristatum,— as Pursh and Ibrrey 

 hart supposed. 



f j- f Frond bipinnate. 



5. A. margixale, IVilld. Frond sub-bipinnatc ; leaflets lanceolate, 

 sub-pinnate, smooth ; segments oblong, obtuse, crenatc-serrate, decur- 

 rent, the lower ones nearly distinct; sori marginal, distinct ; stipe chaf- 

 fy. Beck, Bot. p. 450. 

 Nephrodium marginale. Mx. Am. 2. p. 267. 



Marginal Astipiumt. 



Fronds 9 to IT) inches Ion?, and 4 to 6 inches wide, in their outline lanrc-oblonz 

 and acuminate, pinnate, bluish-green,— the leaflets sub-opposite, distinct, 2 to 4 

 inches long, and 3 fourths of an inch to an inch and quarter wide, oblonglanceo- 

 late and acuminate, sub-pinnate, or deeply pinnatifid (the acuminatum crenate). 

 distinct, subsessile, smooth, with the rachis of the leaflets membranaceously \ i- 

 lose ; segments half an inch to near an inch long, and 2 to 3 or 4 lines wide, ol* 

 long,obtu8e, crenale-serrate,decurrcnt, the lower ones nearly distinct, with a very 

 narrow decurrencc on the rachis or midrib ; common rachis somewhat chaffy, or 

 membranaceously pilose ; stipe 4 to 8 inches long, clothed with a tawny membran- 

 aceous chaff, especially at or near the root, where it is somewhat tufted. Sori 

 middle-sized, marginal, one at each notch in the eegments o! the frond (the lower 

 leaflets mostly sterile) ; indusium orbicular, with a small notch or sinus on O&Q 

 side. 

 /Tab. Rocky woodlands : frequent. Fr. July. 



6. A. dilatatum, JVilld. Fjr&tf d suMripinnatc \ pinnules or secondary 

 leaflets distinct, lance-oblong, incisely pinnatifid ; segments mucronate* 

 serrate ; stipe chaffy. Beck, Bot. p. 450. 



A. intermedium. Muhl. CataLp.97. Bart. Phil. 2. p. 208. Also, 

 IFilld. Sp. 5. p. 262. Pursh, Am. 2. p. 663. JK'utt. Gen. 2. p. 250. 



Dilated Aspidium. 



