816 Oedeb 160.— FILICES. 



e Fruit-dots dorsal, oblong or linear, parallel with tho midvein WoODWAEDli. 18 



g Fruit-dots dorsal, oblong or linear, transverse to the midvein. (k) 



k Indusia single, regularly arranged in 2 rows Asplenhtm. 14 



k Indiisia single, scattered irregul.arly, placed angularly Antigramma. 15 



k Indusia double, regularly arranged. Froud simple Scolopehdeidu. 16 



g Fruit-dots dorsal, orbicular, (o) 



o Indasium cup-shaped, fixed beneath all around tho sorus Woodsia. 17 



o Indusium hood-shaped, fixed at the base and 2 sides Cistoptarie. IS 



o Indusium peltate or renifm, — all involved in the berry-like segm.ONOCLBA. 19 

 — all superficial on the flat segm Aspidiitm. 20 



1. OPHIOGLOS'SUffl, L. Adder's Tongue. (Gr. o(ptg, a serpent, 

 yXcJaaa, tongue.) Sporangia roundish, depressed, opening transversely, 

 arranged in two rows along the margins of the fertile frond ■which is 

 contracted into a linear spike ; indusium none, veins reticulated. 



1 O. vulgitiim L. Frond simple, oblong-ovate, obtuse, reticulations ehngaied; 

 Spike oauline, root of thick spreading fibres. — A curious little plant in low grounds. 

 Fronds solitary, 2 — 3' long, f as wide, amplexicaul, entire, smooth, without a 

 midvein, situated upon the stem or stipe a little below the middle. Stipe 6 — 10' 

 high, terminating in a lance-linear, compressed spike, 1 — 2' long, with the fruit 

 arranged in 2, close, marginal ranks. Sporangia opening outwards and horizontally, 

 beoomjng lunate, distinct, straw-colored. Vernation straight, not circinate. June. 



2 O. bulbosum L. Frond simple, ovate or orhiculate, or reniform, subcordate, 

 nearly or quite radical, obtuse ; reticulation^ short, spike cauline ; root a sulgloious 

 lyXb. — ^Wet pine barrens, N". J. (Pursh) to Ga. and La. Sts. about 3' high, often 

 2 from tlio same bulb, spike short, oblong (4 to 8"). Lvs. 2 or 3, one of them 

 cauline. Bulbs, 3 to 6" diam. 



2. BOTRYCHIUM, Swartz. Mo onwort. Grape Fern. (Gr. jSorpv?, a 

 cluster of grapes ; from the resemblance of the fructification,) Sporangia 

 suhglobous, 1-celled, 2-valved, distinct, coriaceous, smooth, adnate to 

 the compound rachis of a racemous panicle ; valves opening transversely. 



§ Frond ternately divided, situated near the base of the stipe or stem Nos. 1, 2 



§ Frond pinnately divided, situated at or above the middle of tlie stem Nos. 3, 4 



1 B. lunarioides Swartz. Scape bearing the frond near the base; frond in 3 

 bipinnaUfid divisions; segments obliquely lanceolate, crenulate; spikes bipinnate. 

 — Native of shady woods and pastures. Frond almost radical, of a triangular 

 outline, 3 — 5' long and wide, of a stouter texture than No. 4, distinctly petiolate. 

 Scape thick, 8 — 12' high, bearing a tawny, compound panicle 2 — i' in length, 

 composed of numerous little 2-ranked spies, -iug. (B. obliquum Muhl. B. 

 fumarioides Willd.) 



i8. DissECTUJt. Frond near the base of the scape, more munerously dissected, 

 almost tripinnatifid. (B. dissectum Willd.) 



2 B. sfinplex Hitchcock. Frond ternccte, borne near half way up the stalk ; If is. 

 cuneaie-obovate, subentire or incised, unequal ; spike compound, interrupted, uni- 

 lateral; capsules sessile, yellow. — Dry hilly pastures, Vt. and Mass. Stipe or 

 scapo 3 to 6' high. Closely resembles B. lunaria of Eur. Frond varies from 

 simply ternate to ternate-pinnatifid. Jn. 



3 B. negl^ctum. Mebidbn Moonwoet. Frond simply pinnate, with oblong- 

 ovate or oval, incised leaflets, and borne near the summit of the scape ; capsules 

 pedicellate, subsolitary, in an oblong panicle. — Rocky woods, N. H. (Meriden 1) 

 Allied rather to the next than to No. 1. St. 5 to 8' high. Frond 9 to 20" long, 

 half as wide. Lfts. 3 or 4 pairs. Pan. often larger than the fronds. Caps, brown- 

 ish, on very short, thick stipes. July. 



4 B. Virgfnicum L. Rattlesnake Pern. Stipe with a single frond in the mid- 

 dle ; frond twice and thrice pinnate, the lowest pair of pinnae springing from the 

 base ; ultimate segments obtuse, somewhat 3-toothed ; spikes decompound ; plant 

 subpilous. — A beautiful fern, the largest of its genus, in low woods. Stipe or 

 scape 1 — 2f high, bearing the frond about half-way up. This is apparently ter- 

 nate, the lower pair of divisions arising from the base. It is almost tripinnate, 



