1XXXV. 



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

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

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

 venules anastomosing, almost without free veinlets, the lowest 

 forming a series of elongated costal areoles, the rest forming 

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

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

 large costal areoles, which produce a free included anterior venule 

 terminated 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. Rhizome 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 DidymocTilcena and Mesochlana. 



Ex. : P. prolifera, Hook. 



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



POLTDICTTTTM, Presl; MICBOBBOCHIS, Presl; CAKDIOCHL^BITA, Fie; Lo 

 BOCHLJSNA, Fee; PHLEBIOGONTUM, Fee; ASPIDII sp., Auct.; XEPHKO- 

 DII sp., Auct. ; POIYPODII sp., Auct. ; BATHMII sp., Auct. 



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

 tacles terminal on free yeinlets, or medial or compital on anasto- 

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

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

 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. Rhizome short, thick, erect or de- 

 cumbent, or somewhat creeping. We have already, under Aspi~ 

 diwn, adverted to the unsatisfactory nature of the characters 

 which separate that genus from Sagenia. The indusium appears 

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



H3 



