ACBOSTICHE.E. HI. 



12. ANAPAUSIA, Presl, Tent. Pter. 244 (:reduct.); 



Epim. Sot. 185. 



CHEIKOPLEUKIA, Presl; EUKTOSTICHUM, Presl; ACKOSTICHI sp., Auet.; 

 POLYPODII sp., Blume; GYMMNOPTEBIDIS sp., Fee and Auct. 



Sori superficial, non-indusiate, the receptacles occupying the 

 under surface of the contracted fertile fronds. Veins prominent, 

 pinnate from a central costa; the venules 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. 

 Bhizome repent or scandent. The compound venation is the 

 distinguishing peculiarity of this group. 

 Euryostichum. Veins pinnately branched. 

 Ex.: A. aeuminata, Presl. \ A. nicotiansefolia, Pretk 



A. aliena, Presl. \ A. Heudelotii, Presl. 



Cheiropleuria. Veins paLaate-forked. 

 Ex.: A. bieuspis (Polypodium, SIJ \ A. vespertilionis (Gymnopteris, SkJ 



(b) Fronds fertile on the upper pinnee. 



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



Presl, Tent. Pter. 240. 

 CHBTSODIUM, fee. 



Sori superficial, non-indusiate ; the receptacles occupying the 

 under surface of the upper pinnse. Veins uniformly reticulated 

 in small regular hexagonal meshes, without free veinlets. 



Fronds pinnate, thick coriaceous, the upper fertile pinnae 

 usually somewhat narrower. Rhizome thick sub-globose, decum- 

 bent. The Linnsean type of Acrostichum is A. aureum; we con- 

 sequently 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 A. awrewm. 



Ex. : A. aureum, Lin. I A. fraxinifolium, S. Sr. 



A. speciosum, Willd. \ A. insequale, Willd. 



[March, 1857.] c 



