134 FEENS : BRITISH AND FOREIGN. 



fertile decompouiid ; segments forked, linear ; margins revolute, 

 membranaceous, conniving, indusiform. Veins transversely 

 elongated, distantly anastomosing. Spora/ngia occupying the 

 transverse venules, superficial, large, disposed in a simple series, 

 constituting two Uuear sub-parallel sori. 



1. C. thalictroides, Brongn.; Sooh. Gen. Fil. t 12 ; Lowe's 

 Ferns, 2, t. 66. BUobocarpus oleraceus, Kcmlf. Par- 

 keria pteridioides, HooJc. Ex. Fl. t. 147 ; Sooh. ei Grev. 

 Ic. Fil. t. 97. Ceratopteris Parkeri, /. Sm. Gen. Fil. 

 1841.— Tropics. 



Tbibe VI.-PHEGOPTEIlIDEiE. 



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 

 nniversal indusium ; or the dents of the margin reflexed and 

 indusiform. 



* Vema anastomosing in vanous ways. 



t Sori naked. 



§ 1. JDictyopfericB. Primary veins cosfxeform, generally well 

 defined. Sori pmndiform or linear, in ohligue or fra/nsverse 

 rows or lines, or ra/rely reticulated between the primary veins. 



61. DBTOMENIS, Fee ; J. Sm. 

 Vernation uniserial, contiguous or subfasciculate, sub 

 iypogeous. Fronds simple, pinnatifid or pinnate, smooth 



Genoa 61. — Portion of frond. No. 1. 



