228 
knowledge of the subject will not assume that the paucity of species 
caused the author any difficulty, or interfered at all with his arrange- 
ment, which I give, exactly, below :-— 
“ Tribe I. Polypodiez. . 
* Desmobrya. Fronds in vernation terminal, their bases adhe- 
rent, united with and constituting the axis of growth. 
Genera. Xiphopteris, Ctenopteris, Gymnogramma, 
Leptogramma, Phegopteris, Goniopteris, Menis- 
cium, Taniopsis, Pteropsis, Dryomenis. 
** Kremobyra. Fronds in vernation lateral, solitary, and ulti- 
mately separating from the axis by a special articulation. 
Genera. Lopholepis, Lepicystis, Goniophlebium, Pleo- 
peltis, Campyloneurum, Phymatodes, Dicranoglos- 
sum. 
Tribe IT. Acrostichiez. : 
Genera. Elaphoglossum, Rhipidopteris, Polybotrya, 
Gymnopteris, Acrostichum. 
Tribe III. Pteridez. 
Genera. Notholena, Cheilanthes, Adiantum, Litobro- 
chia, Pteris, Blechnum, Lomaria. 
Tribe LV. Aspleniez. 
Genera. Hemidictyon, Asplenium. 
Tribe V. Aspidiez. 
Genera. Aspidium, Nephrodium, Lastrea, Polysti- 
chum, Cyclopeltis. 
Tribe VI. Dicksoniex. 
§ Lindsez. 
Genera. Lindsea, Dictyoxiphium, Dicksonia. 
§ Trichomanex. 
Genera. Trichomanes, Hymenostachys, Hymenophyl- 
lum. 
Tribe VII. Cyathee. 
Genera. Hemitelia, Cyathea, Alsophila, Amphides- 
mium. 
Gleicheniacee. 
Genus. Mertensia. 
Schizeaceex. 
Genera. Lygodium, Schizea, Anemia, Anemidictyon, 
Danza.” 
