CfcYPTOGAMJA FIL1GES 577 



&bs. This is common in all our woodlands,— especially on sleep rocky banks 



of a northern exposure. The young Botanist should be careful to examine the 



fructification of the Aspidiums before it is too old,— otherwise, the disappearance 



of the iwlusium (or membranous veil which covers the young Sort), may Lead him 



to confound the genus with Polypo Hum. 



+ + Frond bipinnatifd. 



2. A. Theltptehis, Wilhh Frond pinnate ; leaflets opposite andal- 

 ternate, distinct, subsessile, slender, lincar-janccolatc, deeply and some- 

 what crcnately pinnatifid ; segments small, opposite, or alternate, ovate- 

 oblong, rathor acute, the margin entire and revolute ; son marginal, 

 contiguous, finally confluent. Beck f Bot. p. 449. 



l\onds 6 to 10 or 12 inches long, and 3 or 4 inches wide, oblong-lanceolate in 

 their outline, pinnate, the leaflets opposite and alternate, 1 to 2 inches long, and 

 1 fourth to I third of an inch wide, linear-lanceolate in their outline, crenately 

 pinnatifid nearly to the midrib, slightly pubescent, subsessile; segments 2 or 3 

 lines long, and 1 or 2 lines wide, ovate-oblong, rather acute, sometimes obtuse, 

 with the margin revolute or recurved, rendering the under surface concave, and 

 sheltering the fructification ; rachis somewhat pubescent ; stipe 9 to 12 or 15 in- 

 ches Ion?, naked. 8ori commencing In small marginal dots, finally confluent, and 

 usually covering the under surface of all the leaflets of the frond. 



Hab. Sphagnous swamps, and wet thickets: frequent, Fr. July. 



3. A. xoveboragesse, Wit[d. Frond pinnate; leaflets opposite or 

 alternate, distinct, sessile, oblong.lanccolate, deeply pinnatifid ; segments 

 oblong, rather obtuse, entire, ciliate ; sori marginal, small. Beck, 

 Bot. p. 449. 

 Nephrodium thelypterioides. Mx. Jim. 2. /;. 267. 



New-York Aspidium. 



Fronds 9 to 15 or 18 inches long, and 3 to 5 or 6 inches wide, in their outline ol> 

 long-lanceolate and acuminate, pinnate, the leaflets sub-opposite and alternate, 

 of a thin delicate texture, 2 to 3 inches long, and 1 third to 2 thirds of an inch wide 

 (the upper and lower ones shorter), oblong-lanceolate, acuminate, deeply pinna- 

 ifid (the acuminatum nearly entire), somewhat pubescent, and pilose on the mid- 

 rib beneath, sessile ; segments 3 to 5 lines long, and 1 or 2 lines wide, linear-ob- 

 long, mostly obtuse, entire and ciliate ; rachis pubescent ; stipe 3 to 5 or 6 inches 

 long, slender, channelled above, naked and smooth, or slightly pubescent. Sari 

 small, marginal, in 2 rows on each segment. 



Hab. Moist woodlands: frequent. Fr. July. 



Obs. The fronds of this species are of a light thin and delicate texture, of a pa- 

 lish green color, and frequently sterile. 



4. A. la5castrien8e? Spreng. Frond pinnate ; leaflets sub-oppo- 

 site, the lower ones petiolate, triangular-ovate, sub-cordate at base, 

 deeply pinnatifid; segments oblong, and obliquely triangular-ovate, 

 rather obtuse, acutely serrate-dentate at apex ; sori distinct ; stipe some- 

 what chaffy. Beck, Bot. p. 449. 



A. cristatum, var. lancastriense 1 Pursh, Am. 2. p. 662. Torr. Comp. 

 p. 381. 



LlXCi-STEK Astidium. 



49 



