LYCOPODIACE^:. 467 



1. O. vulgatum Linn. : root fibrous ; spike cauline ; frond simple, ob- 

 long-ovate, obtuse, closely reticulate. 



Low moist woods. N. S. ; rare. June. '1J-. Stipe smooth and succulent, 

 63 inches high, bearing about the middle a single entire subsessile frond. 

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



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

 ovate, somewhat obtuse. O. crotaloptioroides Walt. 



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

 Frond 1 1J inches long and an inch broad, reticulate. 



Bulbous Adder's-tongue. 



20. BOTRYCHIUM. Swartz. Moonwort. 

 (From the Greek 06rpv$, a bunch 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. Spike 

 pinnate. Small 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. Tatt Moonwort. 



3. B. Virginicum Swartz : 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. Botrypus Vir- 

 ginicus Mich. 



Shady woods. Can. to Car. May July. C 2\.. Scape 1018 or 20 inches 

 high. Frond 3-parted or ternate ; the divisions 46 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^E. 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 



