uw ` ` ON GENERA AND SPECIES. 
now being constituted of species separated from the well- 
known genera Maratiia, Angiopteris, Dana, the technical 
characters of which are, however, so slight that I do not 
consider them worthy of adoption, 
Of Osmundaceae he describes twenty-four species, two of 
which he characterises as a new genus under the name of 
Leptopteris, but which I consider not worthy of being 
separated from Todea of Willdenow. 
: Of Schizaeaceae he enumerates sixty-five species, arranged | 
. . under eight genera, three of which are new—Lophidium, 
consisting of five species separated from Schizæa, and the 
two others upon a single species each, founded upon doubt- 
ful and even mistaken data, one of them (Spathopteris) 
having no other authority than a figure of Plumier’s 
“ Filices,” which, in my “Genera Filicum,” published in 
1841, I show to consist of a barren and fertile frond of ` 
. two distinct Ferns, 
. With regard to Lygodiaceae he describes forty-one species, 
. thirty-nine of which belong to the genus Lygodium of 
a Swartz, and two to Hydroglossum of Willdenow. The 
: number of species of the three latter genera are also in 
. excess, Anemia alone having thirty-eight. | 
COOMPITSIS Ds Phal published another work, entitled. 
. “Hymenophyllacew,” in which he describes 185 species, 
which had hitherto been comprehended under the well. 
known genera Trichomanes and Hymenophyllum, but of 
which Presl makes no less than nineteen genera; and in 
* making twenty-two in all, about one-third of which are 
. founded upon a single species each, The data upon which | 
. these genera are founded is derived chiefly from the size 
_ and form of the cellular parenchyma, and the slight modi- 
_ fications observable in the form of the indusium and 
