LYCOPODIA.CE^. 467 



1. O.vulgatum Linn.: root fibrous; spike cauline ; frond simple, ol> 



iong-ovate, obtuse, clo^y reticulate. 



Low moist woods. N. S. ; rare. June. %-. — Stipe smooth and succulent, 

 6 — 8 inches high, bearing about the middle a smgle eniire subsessile frond. 

 Spike about an inch long, on a slender peduncle. Ccmmon Adder's-tongue. 



2. O. bulbosum Mich.: root bulbous;^ spike cauline; frond subcordate, 

 ovate, somewhat obtuse. O. crotalophoraldes Wqlt. 



Low sandy grounds. N. J. to Car. ; rare. May. %.— Stipe 6 inches high. 

 Frond 1 — 1| inches long and an inch broad, reticulate. 



Bulbous Adder^ s-tongue. 



20. BOTRYCHIUM. Swartz.—Moormoxt. 

 (From the Greek iSorpvg, a hunch of grapes ; in allusion to the fructification.) 



Spore-cases subglobose, 1 -celled, 2-valved, distinct, smooth, 

 sessile along the margin of a compound pinnate rachis, opening 

 transversely. Indusium none. 



1. B. simplex Hitchcock: scape with one frond above; frond ternate, 

 pinnatifid ; segments roundish, cuneate, obovate, entire or somewhat 

 incised. 



Dry woods. Can. N. Y. and Mass. June. %. — Scape seldom more than 

 4 or 5 inches high. Frond solitary, from a torn membranaceous sheath, divided 

 into 3 or 4 unequal segments or pinnatifid ; the segments often much cut. Spilie 

 pinnate. SmaU Moonwort. 



2. B. lunarioides Swartz : scape bearing the petioled frond near the base ; 

 frond smooth, 3-parted, the divisions bipinnatifid ; segments obliquely lance- 

 ovate, crenulate; spike bipinnate. B . fumarioides and obliquum Willd. 

 Botrypus lunarioides Mich. 



Moist low grounds. Can. to Car. W. to .Ark. June. %. — Scape 6 — 15 

 inches long, smooth or slightly hairy. Frond triangular in its outline, petioled, 

 but often more compound ; segments lunate, crenulate. Spore-cases in double 

 rows on the pinnules, which are very narrow and without teeth. B. dissectum 

 Muhl. is nothing more than a variety, with the frond more dissected and the 

 segments narrower. Tall Moonwort. 



3. B. Virginicum Sioartz : somewhat hairy ; scape bearing the frond 

 near the middle ; frond 3-parted, the divisions bipinnatifid; segments ob- 

 tuse, incisely toothed ; spike bipinnate. B. gracile Pursh: Botryp^is Vir~ 

 ginicus Mich. 



Shady wood*!. Can. to Car. May— July. %. — Scape 10—18 or 20 inches 

 high. Frond 3-parted or ternate ; the divisions 4 — 6 inches long, broad-ovate or 

 somewhat deltoid in their outline and again variously subdivided ; segments 

 acutely 2-— 6-toothed. Spike oblong, loose, brownish. 



Virginian Moonwort. Rattlesnake Fern. 



Order CL. LYCOPODIACE^.— Clubmosses. 



Fructification axillary or spiked, composed of 1 — 3 -celled 

 sessile spore-cases containing either minute powdery matter, or 

 grains of larger size. — Moss-like plants, with creeping or pros- 

 trate stems and imbricate leaves, the axis abounding in annular 



