210 BOTANICAL INFORMATION. 
coasts ; spots that have been rendered classical by the pre- 
vious researches of a Don and a Drummond. 
Hooker, Species Filicum. 
The third part of this work has recently appeared, with its 
accompaniment of twenty plates, representing thirty-six spe- 
cies hitherto unfigured, and indeed in general new. The ex- 
tensive genus Trichomanes is brought to a conclusion, and 
embraces eighty-seven species. Some remarks are given on 
the * Hymenophyllacee” of Dr. Presl, with the new genera of | 
which our author expresses himself at variance. Next to the 
Dicksonieæ, the third sub-order, Davalliee, follows. Daval- 
lia itself occupies the whole of the remainder of the forty- 
one pages, and yet does not include all the species. One 
hundred are at present enumerated, the rest will follow in 
the succeeding number. But let it be observed, the author 
preserves the original genus of Sir J. E. Smith nearly entire. 
* After a careful investigation," he observes, “ of numerous 
species, I cannot but come to the conclusion that the origi- 
nal Davallia of Sir J. E. Smith should remain entire as 4 
genus, of which the type may be considered the well known 
D. Canariensis. It is quite true, if we look only to certain 
species of the many new genera that have been separated 
from it, such as Humata, Odontoloma, Saccoloma, Leucostegi4, 
&c., we may find apparently sufficient indications of generic 
difference; but when taking a comprehensive view of the re- 
spective species, we shall observe that, in point of generic 
marks, they gradually pass one into the other, so that I cannot 
even satisfy myself of the efficiency of them as sectional cha- 
racters or subgenera,” Out of respect to their founders, how- 
ever, those genera, with some modifications, when they ©” 
be employed with propriety, generally constitute the grounds 
of his subgenera : of which the first is Humata, Cav. (fourteen — 
species). 2. Leucostegia, Pr. (nine species). 3. Prosaplió; — 
Pr. (three species, and one dubious one). 4. Eudavallt, —— 
