AOEOSTIOHBiE. XXI. 



12. ANAPAUSIA, Presl, Tent. Tier. 244 (§ : reduot.) ; 

 lEyim. Sot. 185. 



Cheieopletjbia, PresZ ; ETTRTosTiOHtrir, Fresl; Aceostichi sp,, ^wcf.; 

 PoLTPODn sp., Blwme ; Gxmmnopteeidis sp., Me and -dwrf. 



iSbW superficial, non-indusiate, the receptacles occupying the 

 under surface of the contracted fertile fronds. Veins prominent, 

 pinnate from a central costa; the vemiles compoundly anasto- 

 mosing, forming parallelogramoid primary areoles, and irregular 

 hexagonal secondary areoles ; or palmate-forked with irregular 

 quadrate primary and sub-hexagonal secondary areoles : both 

 forms with, included free, simple hamate or divaricate veinlets 

 having thickened apices. 



Fronds simple lobed pinnatifid or pinnate, dimorphous, the 

 fertile narrower, sometimes simple; herbaceous or coriaceous. 

 Ehizome repent or scandent. — The compound venation is the 

 distinguishing peculiarity of this group. 

 § Hun/ostiehum.— Veins pinnately branched. 



Ex.: A. acuminata, Fresl. I A. nicotianacfolia, Presl. 



' A. aliena, Fresl. I A. Hendelotii, Presl. 



§ Cheiropleiiria.—Vtxas palmate-forked. 



Ex.: A. bicuspiB (Polypodium, Sl.J | A. vespertUioms (Gymnopteris, ETc.J 



Co) Fronds fertile on the npper piwnce. 



13 ACROSTICHUM, Lirmceus, Gen. Ml. 785, (emend.); 

 Fresl, Tent. Fter. 240. 

 Chbtsodii™, Me. 



Son superficial, non-indusiate ; the receptacles occupying the 

 under surface of the upper pinns. Veins uniformly reticulated 

 in small regular hexagonal meshes, without free veinlets. 



I^onds pinnate, thick coriaceous, the upper fertile pinnse 

 usuaUy somewhat narrower. Ehizome thick sub-globose, deeiim- 



, . rjij^e Linnsan type of Acrosfichim, is J. aweum; we con- 



SMuently retain the name to this very distinct and well-marked, 

 though limited, group. Probably the greater number, of the so- 

 called species are mere varieties of ^. auretm.. 



^„« r^.w I A., fraxinifolium, R. Br. 



^^'- t tTet^i^vrUld. 1 A. insequale, Willd. 



[March, 1857.] 



