248 CRYPTO GA MIA. FILICBS. 



810. PSILOTUM. Swartz>, Bbrnhardia. IViUd, 

 Capsules S-grained, 3-celled; cells opening 



above, semibivalve. 



Stem naked and dichotomous, the branches trique- 

 trous; fructification in spikes. 



Species. P. tnquetriun. Hab. In Florida, indig-enous 

 also to New Holland. Allied to Lycopoclium. 



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

 Capsules naked, 1-ccllcd, connate in an arti- 

 culated distichal spiiif, -^-valved, opening trans- 

 versely. 



Plants consisting" of a single radical nerveless, and 

 complaiiate leaf, emitting for the most part a simple pe= 

 dunculaiedspike. 



Species. 1. O. -DUigatum? Frond oblong-o\-ate, obtuse» 

 closely reticulated. Pi-obably distinct from the European 

 species. '2. bulbosum. 3.* pusillmn. Spike cauline; frond- 

 cordate, acure; root Ha3. On \he margins of 

 ponds, in South Carolina. Scarcely ever more than an 

 inch higl). 



812. BOTRYCIIIUM. Swart%. (Mnorvwort.) 

 Capsules stibglobose ruinate to tlie racliis of 



tiie compound raccmt, soparatej naked, l-ctll«nl, 

 valves 2, connected behind, opening tjansveisely 



Frond solitary, ternately decompounded, (or m B. Lu- 

 naria simply pseudopinnate,) adnata to ihe scape. 



Species. I. B. ///Kiajvo/r/e*. 2. 06//97/UM1. Pluk. .Mant 

 l20. t. 42r. f. 7. 3- dissectvm. 4. virginicinn- 5. grucje. 



313. LYGODIUM. Swartx. (Snake's-tongue.) 

 Spikes unilateral. Capsules in 2 series, open- 

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

 mit Indusium (or veil) squamiform, covering 

 each capsule. 



Stems twiniiig; fronds pinnate or conjugate, leaflets 

 cordate, entire or lobed; spikelets paniculate. 



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

 sVr'ampy margins of small watercourses from New, Jersey 



