58 ON GENERA AND SPECIES, 
time of the publication of the “ Synopsis,” is stated to con- 
tain 50,000 specimens of Ferns, representing the many 
different states of the species therein described. 
As might be expected from a new writer on Ferns, 
many changes have been made in the nomenclature and 
synonyms, as given in the ** Species Filicum,” there being 
no less than fifty of the names in the “Synopsis” having 
Mr. Baker’s initials prefixed, which is principally con- 
sequent on his having removed species from one genus to 
another, and in many cases giving new specific names, as 
also by the addition of a considerable number of new 
species, 
I have already noticed that in the “Species Filicum " 
species of very distinct habits and characters are placed in 
the same genus; of this there are several remarkable - 
new examples in the “Synopsis,” the most conspicuous of - 
which will be found noticed under the respective genera in 
my general arrangement, 
In December, 1374, a second edition of the “ Synopsis” 
. [was published, containing an Appendix to the first edition - 
| prepared by Mr. Baker, regarding which he says “I have 
endeavoured in this edition to briefly characterize and fit 
into their places the new discoveries and the plants found — 
upon fuller information to have been inadequately dealt - 
with in the first.” This Appendix contains the names of 
438 species, 198 of which bear the initials of Mr. Baker H 
the principal authorities for the others being Mettenius, 
Klotzsch, Karstein, Grisebach, Moore, and Kuhn ; with the 
proton of about twenty, the whole are additions to- the 
2,228 described in the first edition of the ‘‘ Synopsis;” thus 
_ jon the authority of that work the total number of ku 
| species of Ferns amounts to 2,646. i 
Whether the above number is represented by SH dis- 
