ASPIDlEiE. IxiXT. 



the costa j the receptacles terminal on the lower anterior venules. 

 Indusimn oblong-reniform, affixed along the deep sinus. Veins 

 (sterile) indistinctly pinnato-fiiroate, from a central costa, the 

 venules anastomosing, almost without free Teinlets, the lowest 

 forming a series of elongated Costal areoles, the rest forming 

 oblique, mostly elongated, areoles j the marginal ones shorter : or 

 (fertile) less distinctly pinnate, the veins forming a series of 

 large costal areoles, which produce a free included anterior venule 

 temainated by the large sorus. 



Fronds small, simple, herbaceous ; the sterile broader, recum- 

 bent, attenuated and proliferous at the point ; the fertile erect, 

 obtuse, narrower, the costal areole on each side, with its in- 

 cluded sorus, occupying almost the entire width. Khizome short, 

 erect. — A curious and distinct little plant. The sorus and indu- 

 sium are so much elongated, and the sinus by which the latter is 

 affixed so deep, that the fructification has a good deal of affinity 

 with that of DidymochltBna and MesocMcBna. 

 Ex. : F. prolifera, Sook, 



119. SAGENIA, Presl, Tent. Pterid. 86. 



PoLTDiCTTTjK, JPresl; MiCBOBBOCHis, Fresl; Cabsiochi.jgna> Fie; Lo- 



BOCHXiENA, J'^e; FHLEBIOGOITIinr, Fie; ASFIDII &^.^ Auct. ; NephHO- 

 DII Sp., Altct. ; POLTPODII sp., Auct. J Baihuii 8p., Auct. 



Sori indusiate, rotundate, superficial or immersed j the recep- 

 tacles terminal on free veinlets, or medial or oompital on anasto- 

 mosed veinlets. InAitsium cordato-reniform, affixed at the deep 

 sinus. Veins pinnate from a central costa, prominent ; venmles 

 arcuately and compoundly anastomosing in about two or three 

 series of irregular unequal variously-shaped areoles, from the 

 sides of which are often produced free included divaricate (some- 

 times fertile) veinlets. 



Fronds simply or often pedately pinnate or bi-tri-pinnate, 

 herbaceous, usually ample. Ehizome short, thick, erect or de- 

 cumbent, or somewhat creeping. — We have already, under Aspi- 

 divm, adverted to the unsatisfactory nature of the characters 

 which separate that genus from Sagenia, The indusium appears 

 to us to aflbrd the best mark of distinction. There occur 



h3 



