386 ON GENERA AND SPECIES. 
Division III, — SCHIZZEACEJE, Mart. 
Apex of sporangia rayed, analagous to a transverse ring, |. 
generally produced in simple spikes, racemes, or panicles, 
Hz, Lygodium, Sw., Schizæa, Sw., Anemia, Sw. 
Division IV.—OSMUNDACELE, Mart. 2 
Sporangia globose, reticulated, destitute of stria, opening 
vertically in two valves, produced on contracted fronds. 
Ez. Osmunda, Linn., Todea, Willd, 
Division V.—MARATTIACE Æ, Kaulf. " 
Sporangia opaque, horny, unilocular, or multilocular, ; 
destitute of a ring. a 
Ez. Angiopteris, Hoffm,, Marattia, Sm., Danza, Sm. 
More than thirty years have now elapsed since the above 
arrangement was drawn up and published, and during that ` 
time about 1,000 cultivated species have come under : 
my notice, as well as many additional herbarium specimens ` 
new to me, the consequence of which has been to greatly | 
alter my views in the definition of genera and their 
arrangement, which is explained further on. 
. The next general arrangement of this family of plants to 
be noticed is that of Professor Fée, of Strasburg, who in 
1852 published his * Exposition des genres de la famille 
des Polypodiacées.” This great work consists of 887 
| pages of quarto letter press, in which is given the cha- 
pisei of 188 genera, with observations and examples of 
species of each genus, which are illustrated by figures 
occupying thirty-two plates, the whole evincing great 
. talent and research. In this work 2,140 species are enu- 
merated of annulate Ferns; he follows Presl’s method in 
_ dividing them into two divisions founded on the direction 
. Of the ring, but restricts Helicogyratee to the tribe 
Cyathem, thus excluding Gleicheniacew, which is not taken 
