XX. GEITEBA OF FF/BNS : 



10. STENOSEMIA, Presl, Tent. Pter. 237, (non Hk.: 



J. Sm. in part.) 



POLYBOTBY.S: sp., Elume ; ACBOSTICHI sp., Auct. 



Sori superficial, non-indusiate, the receptacles occupying the 

 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 

 venal) areoles; the uppermost and the usually simple veinlets 

 free. 



Fronds herbaceous, ternate or pinnate, with one pair of pinne ; 



the pinnee pinnatifid very oblique bulbilliferous in their axils ; 



the fertile ones very much contracted. Ehizome sub-globose 



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



Ex. : S. aurita, Presl. \ S. ? cieutaria, Presl. 



11. PCECILOPTERIS, Presl, Tent. Pter. 241. (Eschw. 



emend.) 



PoimopTEBis, Eschweiler; BOLBITIS, Schott; CAMPITTM, Presl; CYB- 

 TOGONHTM, J. Smith; HETEBONBCBON, Fee ; ACBOSTICHI sp., Auct. 



Sori 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 veinlets. 



Fronds dimorphous, pinnate, often viviparous. Ehizome 

 creeping. The differences between the two groups here indicated. 

 are too slight for generic characters. Pcecilopteris approaches 

 Jenkinsia through some of the Brazilian species, in which the 

 sori are sometimes rather scattered on the veins than occupying 

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

 pansion of the pinnse. 



Campiwm. Venules anastomosing transversely, with exterior free 

 veinlets. 



Ex.: P.virens(Acrostichum,TT<^;.) I P.Hookeriana(Acrost.proliferum..HVfc) 

 P.Presliana(Heteroneur.J'ee.) | P.subcrenataCAcrostichum.m.^-G'j'.) 

 Cyrtogonium. Venules and veinlets irregularly anastomosing. 

 Ex.: P. heteroclita, Presl. I P. punctulata, Presl. 



P. repanda, Pretl. \ p. prolifera (Heteroneuron, &e.) 



