OEDEE CXLH. FILICES FERN-FAMILY. 



221 



7. CTSTOPTERIS. Borf roundish. Indnslum oblong-renlform, cucullate, In- 

 flated nt base, attached by the inner side, and opening on tbe other. 



8. WoAoslA. Sort jlobular. Indusium attached by the base all the way 

 ronnd, opening above at the centre. 



9. DEYOFTERIS. Sort round. Indosium ronnd-reniform, flattened, opening 

 all round. 



10. PoLYSTTriiusf. Sort round. Indusium orbicular, depressed and attached 

 at the centre, opening all round. 



11. OxocLt*. Sort on separate, smaller fronds, Inclosed In a sort of berry- 

 like involucre, at first separate, at length confluent 



SUBORDER II. Osmundineso. 



Sporangia naked, destitute of a ring, opening by a longitudinal slit. Frond 

 circinate in the bud. 



12. OSMCSDA. Sori large, subglobose, pedicellate. 



SUBORDER III. Ophioglossea). 



Sporangia 1-celled, opening by a transverse slit, destitute of a ring. Frond 

 not circinate in the bud. 



13. BoTBYcnioH. Sporangia In a racemose panicle, distinct. 



1. POLYP&DIUM. 



Sori roundish, irregularly scattered on the under surface of 

 the frond. Indusium none. 



1. P. vulgdre. Polypod. 



Frond oblong In outline, deeply plnnatifid ; segments oblong, obtuse, obscurely 

 crenate, green on both sides ; stlpo smooth, naked ; sort large, roundish. A 

 common evergreen fern In woods, where Its creeping, scaly rhizomas form large 

 patches, distinguished by the oblong, simply plnnatifld fronds and nearly entire, 

 oblong segments. Frond 6' IS' high. July. 



2. P. Phegopteris. Triangular Polypod. 



Frond annual, twice plnnatifld, triangular In outline, longer than broad, 

 hairy on the veins ; pinna; lanceolate. ; 2 lower ones deflexcd ; tbe ultimate seg- 

 ments oblong-linear, entire; sori minute. An elegant forn, distinguished by 

 IK triangular outline, and tbe deflexed lower pair of pinna, which make It ap- 

 pear somewhat hastate. Rhizoma blackish. Frond 6' 12' high. Bather com- 

 mon In rich, rocky woods, especially towards the North. July. 



3. P. Dryopteris. Ternate Polypod. 



Stipe very slender, smooth, brittle ; frond ternate, divlslona twice pinnate, 

 spreading, deflexed, light green, very thin and delicate In texture ; ultimate 

 segment* oblong, obtuse, somewhat crenate ; sort on the margin ; rhlzoma fill 

 form, creeping. An exceedingly delicate and beautiful fern, growing In tbe 

 thade of rocky, and especially mountainous woods. Frond 4f 8" high. July. 



1. STEUTHIOPTERIS. 



Sori on separate, smaller fronds, at length covering the entire 



lower surface, arranged on the pinnate, unconnected veins, desti- 



tute of an indusium. 



1. 8. Germdnica. 



Ostrich Fern. 



Stipe erect, slender, black, bearing a 2-parted frond at top, each division con- 

 sisting of several slender segments branching from ono side, and bearing nu- 

 merous, oblong-rhomboid segments, which are oblique, pctiolate, entire on the 

 margin next the rachls, iociscly cut at the other margin, appearing as if valvcd, 

 and of a glaucous green. A very elegant and graceful fern, distinguished by 

 the black, polished stipe and branches, and delicate foliage, 8' 15' high. July. 



5. ASPLiNrOM. 



Sori linear or oblong, oblique, scattered, attached lengthwise, 

 [ndusinm opening lengthwise in the direction of the mid-vein. 



Sterile fronds tall, with stout, smooth, channelled stipes, pinnate ; plnn 

 eweile, plnnatifld ; ultimate segments entire ; fertile fronds much smaller, with 

 numerous, contracted, brownish segments covered with sori. A very large 

 and ihowy fem, not uncommon in low, rich woods, growing In clumps. The 

 fertile fronds are about a foot high, the sterile frondf 84 ft., and even higher. 



a PTfcBIS. 



i linear, very narrow, confluent in & continuous, marginal 

 line. Indusium continuous, attached by the margin. 



1. P. aquilina. Brake. 



8Upo erect, stout, bearing the ternate frond at summit ; divisions blplnnate, 

 very spreading; ultimate segments oblong-lanceolate; upper segments entire ; 

 lower somewhat plnnatifid, with ol,tue, oblong lobesi A tall stout fern, trian- 

 gular in outline, with a dull green frond, and usually purple stipe. Very com- 

 mon In pastures, fields and thickets. The continuous Indnslnm forms a margin 

 to all the segments of the frond, which, together with tbe stipe, Is 2 ft high 

 Aug. 



4. ADIiNTUM. 



Sori roundish, marginal <m the lobes of the frond. Indusium 

 reniform, app<-:iriui; lik. i margin of the frond, and bear- 



ing the sporangia uii its under surface. 



1. A. pedatum. 



Maiden-hair. 



1. A. ebeneum. 



Ebony Spleenivort. 



Frond on a short, smooth stipe, erect, linear-lanceolate in outline, pinnate; 

 ptnnte lanceolate-oblong, somewhat falcate, serrate, sessile, auricttlato at base 

 on the upper side ; sort numerous, In short lines on both sides of the mid-rib. 

 A Blender, elegant fern, with a smooth purple stalk, growing 6' 15' high. 

 Common in rocky woods. Aug. 



2. A. Trich6manes. 



Dwarf Spleen-wort. 



Fronds tufted, linear In outline, pinnate; ptnnte small, roundish-elliptical, 

 learly sessile, oblique and entire at base, crenate above. A delicate little fern, 

 common in tufts on shaded rocks, 8' 7' high, with very slender, purple stalks. 

 July. 



3. A. thelipterdides. Silvery Spleenwort. 



Frond with a chaffy stipe, pinnate ; pinnffi deeply pinnatifld, linear-lanceo- 

 late; ultimate segments oblong, obtuse, with 2 rows of shining, silvery sori, 

 which, when young, are covered with shining, silvery indusia. A handsome 

 fern of a pale green color, not uncommon in low, shaded grounds. It is dis- 

 tinguished before maturity by the shining silvery hue of the indusia. Frond 

 18 ft high. July. 



4. A. Filix-feemina. Common Spleemvort. 



Frond oblong, or oblong-lanceolate in outline, blpinnate, entirely smooth ; 

 pinnffi lanceolate, acuminate ; segments oblong-lanceolate, plnnatifldly cut and 

 toothed ; sori large, oblong, numerous, finally confluent over the whole under 

 surface of the frond, and giving It a dark-brown color. Very common In moist 

 fields and woods. Frond i 8 ft high. July. 



6. DICKS&NIA. 



Sori roundish, marginal, distinct. Indusium double ; one con- 

 sisting of a recurved, 2 lipped, little sac, that opens outward, 

 and is attached by its edges to the proper indusium, which is 

 marginal and opening inward. 



1. D. punctilobula. 



Gossamer Fern. 



Frond slightly hairy, ovate-lanceolate In outline, pinnate ; pinna) deeply 

 twice pinnatlfld ; ultimate segments cut and toothed ; sori minute. A very 

 delicate and beautiful fern, remarkable for the numerous and very fine divisions 

 of its pale-green frond, 2 3 ft. high. July. 



T. CYST6PTEBIS. 



Sori roundish. Indusium oblong-rcniform, cucullate, inflated 

 at base, attached by the inner side, and opening on the other. 



1. C. frdgUis. Bladder Fern. 



Frond oblong-lanceolate In outline, bi- or tri-pinnate; ultimate segments ob- 

 long or oblong-ovate, more or less pinnatind and toothed ; rachis winged by tho 

 decurrent segments. A slender and variable species, common on moist, shaded 

 rocks. July. 



8. W06DSIA. 



Sori globular. Indusium thin, attached by the base all the 

 way round, open above, at the centre, with a variously cut and 

 fringed margin. 



1. \V. obtusa. 



Hairy Wood Fern. 



Frond ovate-lanceolate in outline, very slightly hairy ; pinnm ovate or oblong, 

 very broad at base so as to be somewhat triangular, almost pinnate again ; ulti- 

 mate segments oblong, ronnded at apex, pinnatiftdly divided into lobes, each of 

 which bears a single frnlt-dot A little forn 6' 8' high, growing In tufts on 

 rocks. The stipe is slightly chaffy. 



