452 CRYPTOGAMlA LYCOPODINEJE. 



HAB. Low grounds. Fronds 3 5 feet high; stipe covered witn 

 brown hair ; fertile fr. spike-like, sometimes bearing a few leaves. 



O. interrupta : frond pinnate, smooth ; divisions pinnatifid ; segments 

 oblong, rather acute, entire ; some of the intermediate divisions fruc- 

 tiferous. 



HAB. Low grounds. Fronds 3 4 feet high ; several central pairs 

 of the divisions fertile, dark-br. 



O. regalis : frond bipinnate ; segments oblong, distinct, serrulate ; ra- 

 cemes terminal, compound. 



HAB. Swamps. About 4 feet high ; smooth ; panicle large, very 

 compound. 



419. OPHIOGLOSSUM. Adder's tongue. 



O. vulgatum : spike cauline ; frond oblong-ovate, obtuse, closely reticu- 

 late. 



HAB. Wet meadows. June. About a span high ; leaf solit. entire ; 

 spik. linear, %-rowed. 



420. BOTRYCHIUM. 



B. simplex : stipe with a single frond above ; frond subpinnate ; seg- 

 ments 3 5, rarely 7, roundish obovate, sometimes lobed. 



HAB. Dry woods. July. About 4 in. high ; frond very small, vari- 

 able. 



'B.fumarioides : stipe naked ; frond smooth, radical, 3-parted, bipinnate ; 

 leaflets lunate, crenate ; spikes bipinnate. 



HAB. Shady woods. Aug. A foot high ; stipe rather thick ; frond 

 somewhat succul. 



B. virginicum : somewhat hairy ; scape bearing the frond in the mid- 

 dle ; frond 3-parted, bipinnatifid ; divisions incisely pinnatifid ; seg- 

 ments obtuse, about 3-toothed ; spikes decompound. 



HAB. Woods. July. Nearly 2 feet high; stipe mostly hairy; 

 frond thin ; spik. often geminate. 



b. gracile : smooth ; spike bipinnate, on a long, slender peduncle. 



HAB. Dry woods. A span high ; frond and spike delicate, very 

 smooth. 



LYCOPODINE^E. 

 421. LYCOPODIUM. Club-moss. 



* Spikes pedunculate. 



L. davatum : stem creeping, with ascending branches ; leaves scattered, 

 incurved, ending in nairs ; spikes geminate or ternate, cylindrical, 

 pedunculate; scales ovate, acuminate, coarsely dentate. 



HAB. Woods. Julv. Stem long, trailing ; leaves ending in a di- 

 aphanous bristle, entire or serrul. 



L. complanatum : stem trailing, with dichotomous branches ; leaves 2- 

 rowed, connate, superficial ones solitary ; peduncles elongated, sup- 

 porting 4-cylindrical spikes. 



