248 CRTPTOGAMIA. FILICES. 



810. PSILOTUM. 8wart%, Bbrnhakdia. Willd. 

 Capsules 3 grained, 3-celied; ceils opening 



above, senjibivalve. 



Stem naked and dichotomous, the branches trique- 

 trous; fVuciificution in spikes. 



Species. P. triquetriun. Hab. In Florida, indigenous 

 also to New Holland. Allied to Lycopodlum. 



811. OPHIOGLOSSUM. L. (Adder's-tongue.) 

 Capsules naked, I -celled, connate in an arti- 

 culated distichal spike, 2-valved, opening trans- 

 versely. 



Plants consisting" of a single radical nerveless and 

 complanate leaf, emitting for tiie most part a simple pe- 

 dunculaied spike. 



Species. 1.0. vulgatum? Frond oblong-ovate, obtuse, 

 closely reticulated. Probably distinct from the European 

 species. 2. bidbosiiin. 3. * piisillum. Spike Ciiuline; f; ond 

 cordate, acute; root iIab. On tiie margins of 



ponds, in South Carolina. Scarcely ever more than an 

 inch high. 



812. BOTRYCHIUiM. Swart%, (Moonwort.) 

 Capsules subirlobose adnata to tiie raciiis of 



tiie CDiiipound raceme, separate, naked, 1-ceIi d, 

 valves 2, connected beiiind, opejimg transversely. 



Frond solitary, ternately decoTnpr»unded, (or in B. Lu- 

 naria simpl}' pstudopinnate,) aduate to the scape. 



Species. 1. M. /uwarmVfes. 2. obliquum. Pluk. Mant, 

 120. t.427. f. 7 ■ 3 dissectiim. 4. virginicnrn. 5. grucile. 



813. LYGODIUM. Swartz. (Snake's-tongue.) 

 Sjnkes unilaU'ral. Cansules in 2 series, op.-n- 



ing on tbe inner side from tiie base to the sum- 

 mit. Indudum (or veil) squaniiform, covering 

 cacii capsule. 



Stems twining; fronds pinnate or co?iiiigate, leaflets 

 cordate, entire or lobed; spikelets paniculate. 



Sfecies. 1. L. pabnatum. Hab. In thickets on the 

 swumpy margins of sniail water courses froia New Jersey 



