GENEBIC CHABACTEES. 



Order POLTPODIACE.E. Tribe POLYPODINE^. 



1. ACBOSTICHE.ffi. 



(a) Fronds wholly fertile. 

 * Veins free. 



1. 'POIjY'BOTIiYA t Huml>oldtandonpland; Willd. Sp., 



Plant, v. 99. 



EGBITOLFIA, ScTiott; LACATTSSADEA, Gaudichaud; ECTOITEUBA, Fee; 

 GEAlTOLiifA, Sory: Fee; BOTBYOTHALLUS, Klotzteh MS.; PSOMIOCABPA, 

 Presl; MICHOSTAPHYLA, Presl; ACBOSTICHI sp., Auct.; OLFERSLS sp, 

 Presl ; Aif OGBAMMATIS sp., Fee ; GYHKOGRAMMATIS sp., Auct. ; OsMFir- 

 D.S sp., Jacquin. 



Sori superficial, non-indusiate, the receptacle occupying the 

 whole under surface, or both upper and under surface of the 

 rachiform fertile fronds. Veins simple or forked, or pinnate from 

 a central costa ; venules simple or forked, free. 



Fronds dimorphous, pinnate, or bi-tri-pinnate, the fertile with 

 linear contracted segments. Khizome creeping or scandent. In 

 this genus occurs the highest degree of development of which the 

 Ferns seem susceptible. In some of the species, the whole surface 

 of the fertile fronds, above and below, is sporangiferous. Micros- 

 to/phyla is a small plant of peculiar aspect, but does not afford any 

 good characters on which to separate it from Polybotrya. 

 . Eupolybotrya. Fronds sporangiferous beneath ; veins pinnate. 



Ex. : P. cylindrica, Elf/i. I P. osmundacea, H.B.E. 



P. artieulata, J. 8m. P. appendiculata, J. 8m. 



P. nodiflora, Sory. \ P. Gaudiehaudiana (Egenolfia, Ffe.) 



MicrostapJiyla Fronds sporangiferous beneath; veins simple or forked. 

 Ex. : P. bifurcata, Lk. 



Psomiocarpa. Fronds sporangiferous on both surfaces ; veins pinnate. 

 Ex.: P. caudata, Kze. \ P. apiifolia, J. Sm. 



2. BHIPIDOPTEBIS, Schott, Gen. Fil. (under t. 15.) 



PBI/TAPTEBIS, Link; OSMUNDS sp.; Swartz ; ACEOSTICHI sp., Auct. ; 

 OIFEESUE sp., Presl; POLYBOTBY.S sp., J. Smith. 



Son superficial, non-indusiate, the receptacles occupying the 



