DIDYMOCHLJENE2E. Ivii. 



(b) Veins connivently anastomosing. 

 76. MESOCHLJENA, R- Brown, Pl.'Jav. Bar.5. 



SPHJEKOSTEPHASTOS, J. Smith ; POLTPODII sp., Wallich ; STEGHOGBAM- 

 MATIS sp., Fee. 



Sori indusiate, oblong, parallel, oblique (hippocrepiform, 

 Metten.) ; the receptacles medial, crest-formed, on the simple 

 veins. Indusium membranaceous, rounded at the apex, truncate 

 at the base, attached longitudinally along the middle of the sorus, 

 the margins glandular, free. Veins simple from a central costa ; 

 the lower or more opposite pairs angularly connivent-anastomos- 

 ing (as in Nephrodium.} 



Fronds large, herbaceous, pinnato-pinnatifid, hairy. Ehizome 

 short, erect. Sori often crowded and becoming confluent, the 

 indusium then pushed up vertically between the spore-cases. 

 This gemis may be regarded as analogous to Stegnogramma, 

 differing from it technically in being indusiate, the indusia being 

 double or centrally attached. 

 Ex. : M. asplenioides, J. Sm. \ M. javanica, S. Sr. MS: J.Sm. 



(a) Veins parallel, longitudinal, scarcely reticulated. 



77. POLYT^NITTM, Desvaux, Ann. Soc. Lin.Par. vi. 218. 



ANTROPHYI sp., Auct. ; HEMIONTTIDIS sp., Auet . ; LOXOGRAMMATIS sp., 

 Presl; VITTAEI^ sp., Auct. 



Sori non-indusiate, narrow linear-elongate, immersed, parallel, 

 rarely anastomosed ; the receptacles therefore scarcely reticu- 

 lated. Veins uniform, ecostate, elongate-parallel, here and there 

 distantly reticulated, forming elongate linear areoles. 



Fronds simple, sub-coriaceous. Rhizome sub-globose. Sori 

 forming three four or more lines occupying nearly the length 

 of the frond. The long parallel, scarcely reticulated sori distin- 

 guish this from Antrophyum, which it thus serves to connect 

 with the Tanitideas. 

 Ex. : P. lineatum, J. Sm. \ P. Grevillii (Antrophyum, BatfJ 



LApril,1857.] p 



