1 34 FERNS : BEITISH AND FOREIGN. 



fertile decompound ; segments forked, linear ; margins revolute, 

 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. ; Hook. Gen. Fil. t. 12 ; Lowe's 

 Ferns, 2, t. 66. Mlobocarpus 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 YL PHEGOPTEBIDEJE. 



Son punctiform, intra-margiaal 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 

 f Sori naked. 



1. Dictyopterice. Primary veins costceform, generally well 

 defined. Sori punctiform or linear, in oblique or transverse 

 rows en" 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 61. Portion of frond. No. 1. 



