AN ENUMERATION OP CULTIVATED FERNS. 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 SMUNDACEM 
Sporangia globose, oval or oblong, opening vertically ; apex 
striated, the striae forming a more or less complete ring, which 
is sometimes rudimentary only. 
Tribe I. — SCHIZiEiE. 
Sporangia oval or oblong, opening on the exterior side, nro- 
duced on contracted racemes, or od, 
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. 040 ; Lowe's Ferns, 
8, t. 74 ; Hook. Fil. Exot. 
t. 24 . — ZSTorth America. 
T. 
S 
Genus 141 .— Portion of fertile 
froud, under side. No. 2. 
4 
