XX. &ENEEA OP PEBlfS : 



10. STENOSEMIA, Fresl, Tent. Pier. 237, (non Hk.: 



J. Sm. in part.) 

 PotXBOTETJS Bp., Blume; Aceostiohi sp., Auct, 



Son superficial, non-indusiate, the receptacles oooupying tie 

 whole under surface of the much contracted fertile fronds. Veins 

 (sterile) pinnate from a central costa, the lowermost (basal) venules 

 (or veinlets) anastomosing so as to form elongated costal (or 

 renal) areoles; the uppermost and the usually simple vemlets 

 free. 



Fronds herbaceous, temate or pinnate, with one pair of pinnae ; 



the pinnae pinnatifid yery oblique bulbilliferous in their axils ; 



the fertile ones very much contracted. Rhizome sub-globose 



erect. — The spore-cases cover the surface on each side the costa. 



Ex. : S, aurita, Preal, 1 S, ? cicutariaj jPresl. 



11. PCECILOPTERIS, Fresl, Tent. Fter. 241. (Esohw. 



emend.) 



PoiKiLOPTEHis, Eschweileri Boi-bitis, SclwU; CiKPrirM, Presl; Cte- 

 TO&ONiTrar, J. Smith ; HETBBONEnBOiTj F^e ; Acbosticei sp., AiLct, 



Son superficial, non-indusiate, the receptacles occupying the 

 under surface of the contracted fertile fronds. Veins pinnate 

 from a central costa, prominent ; venules arcuately, angularly or 

 irregularly anastomosing ; sometimes producing exterior free or 

 irregularly anastomosing Teinlets. 



Fronds dimorphous, pinnate, often viTiparous. Khizome 

 creepiug. — The differences between the two groups here indicated, 

 are too slight for generic characters. Pceeilopteris approaches 

 Jenhiasia through some of the Brazilian species, in which the 

 sori are sometimes rather scattered on the yeins than occupying 

 the whole surface ; a condition probably owing to an undue ex- 

 pansion of- the pinnae. 



§ CaraptMm.— Tennles anastomosing transversely, with exterior free 

 veinlets. 



Ex.: P.TOen8(Aorostiohuni,JF(rfJ.) I P.Hookeriana(Aero8t.proliferamiri) 

 P.Presliana(HeteroneurJVe.) | P.Bubcrenata(Acrosticlinin,ait.|-(JrJ 

 § Cj/rfo^onram.— Venules and Teinlets irregnlarly anastomosing. 

 Ex.: P. heterocUta, Freal. | P. pnnctnlata, Fresl 



P. repanda, Pretl. \ P.prolifera (Heteroneuron, F4e.) 



