Ivi. GENERA OF lEBNS : 



with the receptacles, as in Diplaziwn. Indusium narrow, plane, 

 membranaceous, diplazioid. Veins forked (rarely simple) from 

 a central costa ; venules parallel below, soriferous on the elon- 

 gated parallel portion, reticulato-anastomosing in one or two 

 series of short areoles near the margin; the marginal veinlets 

 free. 



Fronds coriaceous, simple or pinnate. Rhizome " creeping." 

 The peculiarities of this group consist in the venules being parallel 

 and distinct near the costa, and reticulated near the margin. The 

 structure of the venation accords with that of Hcemidictyum 

 among the asplenioid series, and of Antigramma among the sco- 

 - lopendrioid series. 



Ex. : O. alismaefolium, J. Sm. ( Ochlogramma Cumingii, Presl .) 



0. integrifolium (Diplazium integrifolium and cordifolium, Sl.J 



(a) Veins free. 



75. DIDYMOCHL^NA, Desvaux, Serl. Mag. v, 303, 

 t. 7, fig. 6. 



MOITOCHLSNA, Gaudickaud ; HIPPODITTM, GaudichaudlfS.; CEEAMIUJC, 

 Beinicwdt ; TEGULABIA, Beinwardt ; HYSTEBOCABPUS, Langidorff MS. ; 

 DIPIAZII sp.,Baddi; ASPIDII sp., Auct.; ASPLBNII sp., Auct.; ADIAWTI 

 sp., Auct. 



Sori indusiate, elliptic-oblong ; the receptacles oblong dorsal, 

 at the apex of the veuules. Indusium of the same form, obtuse 

 at both ends, attached longitudinally along its centre to a crest- 

 formed elevation of the receptacle, free at the margins. Veins 

 flabellately-forked ; venules direct, free ; the anterior one in each 

 fascicle soriferous, the sterile ones clavate at the apex. 



Fronds bi-pinnate, coriaceous ; pinnules dimidiate or sub-dimi- 

 diate, obtuse, articulated, sub-ecostate. Ehizome arborescent. 

 Handsome tree ferns, with peculiar fructifications. It is probable 

 that the several names which have been proposed, all belong to 

 one species ; Kunze's D. dimidiata is, however, said to differ 

 from the rest in being entirely ecostate. 



Ex.: D. lunulata, Desv. (Adiantum, Houtt. ; D. sinuosa, Dw.: D. trun- 



catula, J. Sm J 

 D. dimidiata, Kze. 



