134 
FERNS : BRITISH AND FOREIGN. 
fertile decompound ; segments forked, linear ; margins revokite, 
membranaceous, conniving, indusiform. Veins transversely 
elongated, distantly anastomosing. Sporangia occupying the 
transverse venules, superficial, large, disposed in a simple series, 
constituting two linear sub-parallel sori. 
1 . C. thalictroides, Brongn. ; Hoolc. Gen. Fil. i. 12 ; Lowe's 
Ferns, 2, t. 66. Ellobocarpus oleraceus, Kaulf. Par- 
keria pteridioides. Hook. Ex. Fl.t. 147 ; Hook, et Grev. 
Ic. Fil. t. 97. Ceratopteris Parkeri, J. Sm. Gen. Fil. 
1841. — Tropics. 
Tribe VI.-PHEGOPTERIDE.®. 
Sori punctiform, intra-marginal or rarely on marginal dents, 
naked or each furnished with a special indusium, which is 
either peltate or lateral and interiorly attached, rarely calyci- 
form ; or the margin of contracted fronds revolute, forming an 
universal indusium ; or the dents of the margin reflexed and 
indusiform. 
* Veins anastomosing in various ways. 
f Sori naked. 
§ 1. Hictyopterioe. Primary veins costceform, generally well 
defined. Sori punctiform or linear, in oblique or transverse 
rows or lines, or rarely reticulated between the primary veins. 
61. DRYOMENIS, Fee; J. Sm. 
Vernation uniserial, contiguous or subfasciculate, sub- 
hypogeous. Fronds simple, pinnatifid or pinnate, smooth, 
Genus 6l. — Portion of frond. No. i. 
