134 



FERNS : BRITISH AND FOREIGN. 



fertile decompound ; segments forked, linear ; margins revol.rte, 

 membranaceous, conniving, indusiform. Veins transversely 

 elongated, distantly anastomosing. Sporangia occupying tlie 

 transve.se venules, superficial, lai-ge, disposed in a simple series, 

 constituting two linear sub-parallel sori. 



1. C. thalietroides, Brongn.; Hook. Gen.Fil.t.12; Lowe'* 

 Ferns, 2, t. 66. Ellobocarpus oleraceus, Kaulf. Par- 

 keria pteridioides, Hook. Ex. Fl. t. 147 ; Hook, et Giw. 

 Jc. Fil. t. 97. Ceratopteris Parked, /. Sm. Gen. Fil. 

 1841.— Tropics. 



Tbibe YI.-PHEGOPTEBIDE.ffi. 



Sori punctiform, ultra-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 j or the dents of the margin reflexed and 

 indusiform. 



* Veins anastomosing in various ways. 



f Sori naked. 



§ 1. Dictyopterice. 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. DBYOMENIS, Fee; J. Sm. 



Vernation uniserial, contiguous or subfasciculate, sub- 

 Lypogeous. Fronds simple, pinnatifid or pinnate, smooth, 



Gen'is6l.— Portion of Irond. No. 1. 



