AN ENUMERATION OP CULTIVATED PERNS. 



257 



1. H. elegans, Presl. Trichomanes elegans, Rudge, Guian. 

 t. 35 (in part) ; Hook. Gen. Fil. t. 108 ; Hook. Gard. 

 Ferns, t. 2. Guiana, Trinidad, Pacific side of Central 

 America. 



SUB-ORDER IV. O SMUNDACEJE. 



Sporangia globose, oval or oblong, opening vertically ; apex 

 striated, the striaa forming a more or less complete ring, which 

 is sometimes rudimentary only. 



TRIBE I. SCHIZ2EJE. 



Sporangia oval or oblong, opening on the exterior side, t>ro- 

 <duced on contracted racemes, or oix 

 terminal or marginal spike-like 

 appendices, or the fertile frond is 

 wholly contracted, or sub-con- 

 tracted. Apical ring complete. 



141. LYGODIUM, Sw. 



Vernation uniserial, distant 

 and sarmentose, or contiguous 

 and caespitose. Fronds scandent, 

 twining, extending to an inde- 

 finite length; pinnae conjugate, 

 palmate-lobed, pinnatifid or pin- 

 nate. Veins forked, free. Spo- 

 rangiferous spikelets marginal, 

 composed of two rows of imbri- 

 cate indusiate cysts, each cyst 

 containing an oval resupinate spo- 

 rangium attached by its inner 

 side, and opening longitudinally 

 on its outer side. 



1. L. palmatum, Sw.; Schk. 

 Fil.t.l4<Q', Lowe's Ferns, 

 8,2.74; Hook. Fil. Exot. 

 t. 24. North America. 

 T. 



Genus 141. Portion of fertile 

 frond, under side. No. 2. 



