AOEOSTICHEiE. SIX. 



Fronds dimorphous, simple, pinnate, or bi-pinnate j sometimes 

 scaly beneath. Ehizome short, erect, or stout creeping, or scan- 

 dent. Pinnse sometimes articulated. — ^There is no sufficient dis- 

 tinction between Cheilolepton a,nd IfearocaUis. The plants referred 

 to the § Chorizopteris, of which the majority are only known in a 

 barren state, are probably distinct, the winged rachis and easily 

 detached membranaceous segments being peculiar ; their habit 

 is that of Lomagramma, which latter may be indeed an acci- 

 dental form of the same structure, with the fertile parts so much 

 dilated as to produce tsenitoid, instead of aorostiohoid sori. Or, 

 if Lomagramma is normally tsenitoid, these may prove to belong 

 to that genus, when their fructification is known. They, how- 

 eyer, perfectly accord, as far as they admit of comparison, with 

 the Acrostichvm scandens of Baddi, a plant which appears to us 

 to hare nothing to do with Faecilopteris, in which group it is 

 usually placed, and which we bring here. 



§ JfewrocalUa. — ^Receptacles superficial. 

 Ex, : N. prsestantiasima, F6e. \ N. aureo-nitens (Acrostichnm, Sook.) 



§ Cheilolepton. — ^Keceptacles in a shallow ftirrow. 

 Ex. : N. lomarioides, ^Presl. 



? § Chorizopteris. — Pinnae articulate ; rachis winged, 

 Ex. : N. pinnata (Chorizopteris, 

 MoctreJ 

 [N. bipinnata (Chorizopteris, 

 Moiyre.J 



W. scandens (Acrostichum, Maddi.J 

 N. polyphyUa (Lomagramma, Srack.J 



9. HYMENODITJM, Me,mst. Acrost. 20. 



DlCTTOGI-OaSTJM:, J", 5^mi<Aj ACBOSTICHI 8p., Auct.i OL^-E'RaiM sp,,,4uci,; 

 Anetii sp., JPreal. 



Sori superficial, non-indusiate, the receptacles occupying the 

 under surface of the fertile fronds. Veins uniformly reticulated 

 in coarse hexagonal or elongated meshes, without free veinlets. 



Trends simple, the fertile somewhat smaller. Khizome thick 

 decumbent, or slowly creeping. — A genus of distinct aspect, with 

 large simple fronds, uniformly reticulated, the fertile very little 

 contracted ; hence different from Neurocallis. The venation is 

 similar to that of AcrosticMm, from which they differ in having 

 the fronds wholly fertile. 



Ex • H, crinitujn, F4e. | H, pachjphyllum (Acrostichnm, JBje.J 



' ' h', reticulatum (Acrostichran, Klfs.; H, crassifolium, Me.J 



