IxxXTl. OENEBA OP rEENS : 



among these difficult Aspidiece, some species in which the indu- 

 sium is strictly orbicular and peltate, and others in which it is 

 as strictly cordato-reniform. The union of these in one genus, 

 as has been suggested, would also inyolTe the union of such 

 large and well-defined groups as Polysticlmm and Lastrea, in 

 which we cannot concur ; and we have consequently separated 

 them by what seems to ua the most available characteristic. We 

 have, indeed, no doubt that if all the species could be examined 

 in a sufficiently early stage, the indusimu would be found to 

 afford a perfectly satisfactory distinction, 

 § JEusagenui. — Free included veins few or none. 



Ex. : S. cicataria (Aspidium, Sw.J 

 S. coadtmata, J. Sm. 

 S. latifoUa, Fresl. 



S. Hippocrepis, Freal, 



S. apufolia, J. 8m. 



S. dilacerata (ABpidlum, Xze.J 



§ Cardiochl<Bna. — ^Free included veins numerous. 



Es. : S. dccurrens, Soulston. 



S. microsora(ABpidium,PresZ.^ 

 S. maerophyUa(Aspidium,S'a7.j 

 S. pacliypliylla(A8pidimn,ZiBe) 



S. puberula (Aspidium, DeavJ 

 S. sinuosa (Aspidium, LabiU.J 

 S. grandis (Aspidium, J. Sm.) 

 S. vasta (Aspidium, Bl.J 



120. PLEOCITEMIA, Fresl, Tent. Pterid. 183. 



Haplodiotyttm, PregZ; PotTponn sp,,Auci.; Aspmii ap.^Auct.; Nb- 



FHBODIl Bp., Auct. 



Sort indusiate, globose ; the receptacles medial on the &ee or 

 anastomosed venules. Itidtmam reniform, affixed at the sinus. 

 Vidns (of segments=«e««fe«,) simple or forked from a costffiform 

 mid-vein, the lower opposite ones arcuately anastomosing, form- 

 ing elongated angulate costal areoles ; the upper free ; the inter- 

 mediate usually forming one series of unequal hexagonal areoles 

 next the costeeform vein ; marginal veinlets free. 



Fronds herbaceous, ample, bi-pinnato-pinnatifid, the lower 

 pinnffi bi-partite; or small and pinnatifid. Khizome sub-arbo- 

 rescent. — The genuine species of Fleocnemia are large much 

 divided ferns, having, according to Cuming and Brackenridge, a 

 sub-arboreous oaudex. NepJwodium Shimei, J. Sm., agrees better 

 with them than vrith NephrodUim in its venation, especially in 

 the sterile fronds, but not in its general habit. There are per- 

 haps not so many species as Fresl has recorded ; the original 



