among these difficult Aspidiea, 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 involve the union of such 

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

 which we cannot concur ; and we have consequently separated 

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

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

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

 afford a perfectly satisfactory distinction. 

 Eusagenia. Free included veins few or none. 



Ex. : S. cicutaria (Aspidium, SwJ 

 S. coadunata, J. Sm. 

 S. latifolia, Prenl. 



S. Hippocrepis, Pretl. 



S. apiifolia, J. Sm. 



S. dilacerata (Aspidium, Kze.) 



CardiocMana. Free included veins numerous. 



Ex. : S. decurrens, Houlston. \ S. puberula (Aspidium, DesvJ 



S. micro8ora(A8pidium,PregZ.) S. sinuosa (Aspidium, Labill.) 

 S. macrophylla(Aspidium,5w.) S. grandis (Aspidium, J. Sm.) 

 8. pachyphyll a (Aspidium,rze) S. vasta (Aspidium, SI.) 



120. PLEOCNEMIA, Presl, Tent. Pterid. 188. 



HAPLODICTYTM, Pretl; POLTPODII sp.,Auct.; Asrnm sp., Auct.; NB- 



PHBOOII Sp., Atict. 



Son indusiate, globose ; the receptacles medial on the free or 

 anastomosed venules. Indusium reniform, affixed at the sinus. 

 Veins (of aegments=venules,) simple or forked from a costseform 

 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 costseform vein ; marginal veinlets free. 



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

 pinnae bi-partite ; or small and pinnatifid. Ehizome sub-arbo- 

 rescent. The genuine species of Pleocnemia are large much 

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

 sub-arboreous caudex. Nepkrodium Blumei, J. Sm., agrees better 

 with them than with Nephrodium in its venation, especially in 

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

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



