CRYPT0GAM1A FILICES 587 



1. B. ttmartoides, lVilld. Scape bearing thcfrondncarthcbasc; 

 frond 3-partcd, the divisions bipinnatifid ; segments obliquely lance- 

 ovate, crenulate; spike bipinnatc. Beck, Hot. p. 459. 



13. obliquum. Bart. Phil. 2. p. 205. Also, JVilld. Muhl Pursh, &c. 

 Dotrvpus lunarioides. Mx. Am. 2. p. 274. 



FuMAIUA-LlKE BoTRYCHIVM . 



Root a fascicle of coarse fleshy fibres. Frond about 3 inches long, and 4 inches 

 wide, somewhat deltoid or triangular In the outline, bitcrnately dissected, or 

 3-parted, and the divisions irregularly bipinnatifid, petiolate ; segments of the 

 subdivisions obliquely lance-ovate, or oblong, acute, or obtuse, finely crenatc, 

 smooth, rather thick and fleshy (or coriaceous when dry), green beneath, often 

 lawny-ferruginous on the upper surface ; stipe 2 to 3 inches long, angular, or rib- 

 bed, slightly pilose, inserted on the scape about an inch above the root; scape 6 

 to 8 or y inches high, Btriate-angled, or ribbed, bearing at its summit a tawny com- 

 pound or bipinnate spifce2 to 4 inches in length, with the small capsules sessile in 

 double rows on the subdivisions, or pinnules. 



J fab. Moist low grounds : frequent. Fr. July— Sept. 



Obs. The B. obliquum, as Pursh suggested, appears to be nothing but a starved 

 modification of this,— with a more simple frond ;— and has, therefore, been very 

 properly reduced to a variety, by Prof. Torrcy. 



2. B. dtssectum, Muhl. Scape bearing the frond near the base ; frond 

 3-parted, the divisions bi- or tri-pinnatifld ; segments sub-linear, bifid, 

 or 2 or 3-toothed at apex ; spike bipinnate. Beck, Bot. p. 450. 



Dissected Botrychivm, 



Root a fascicle of coarse fleshy fibres. Frond 2 or 3 inches long, and 3 or \ 

 inches wide, somewhat rounded, and obtusely triangular, in their outline, 3 parted, 

 with the divisions irregularly bipinnatifid, petiolate, the subdivisions often much 

 dissected ; segments cuneate-oblong, or linear, 2 or 3-toothed (often bifid) at apex, 

 entire on the margin, smooth, rather thick and fleshy, green beneath, tawny or 

 ferruginous above ; stipe 3 or 4 inches long, striateritbed, somewhat pilose, in- 

 serted on the scape about an inch above the root; scape 6 to 9 inches high, with a 

 terminal compound spike, and capsules, like the preceding. 



Ifab. Moist low grounds: frequent. Fr. August— Sept. 



06s. With the exception of the more dissected frond (and even that varies), 

 this is very nearly related to the preceding species ; nor am I sure it is more than 

 a variety. 



8. B. tircixicum, £w. Scape bearing the frond near the middle; 



frond 3-parted, the divisions bipinnatifid ; segments obtuse, incised-den- 



tate, about 3-toothed ; spike bipinnate. Beck, Bot. p. 459. 



Also, B. gracile. Pursh, Am. 2. p. 657. Nutt. Gen. 2. p. 248. Eat. 



Man. p. 57. 



Botrypus virginicus. Mx. Am. 2. p. 274. 



Virginia* Botrtchium. Vulgo — Rattlesnake Fern. 



Plant somewhat pilose. Frond 3-parted, or ternate, inserted near the middle of 

 the scape , divisions 4 to 6 or 7 inches lone, broad-ovate or somewhat deltoid in 

 their outline, bipinnatifid, petiolate, green ; pinna 1 to 3 inches long, and half an 

 inch to 3 quarters wide, subsessile, deeply pinnatifid, the segments cuneate-oblon? , 

 obtuse, rather thin, incised-dentate at and near tho apex, the teeth 2 to 4 or 5. usu- 



