worthy of notice even as well-marked varieties. I think, could 
the able botanists whose names stand in the above list of syn- 
onyms, inspect the numerous suites of specimens which it is my 
privilege to possess, they would come to very different conclusions 
respecting the limits of species. 
I am not, it is true, acquainted with Zr. Henkeanum of Presl ; 
but as that author’s description is not at variance with 7" cris- 
pum, and as he first considered it to be identical with that 
Fern, we are perhaps not far wrong in bringing it here. 7. 
ertophorum is surely, both from the figure and description, a 
more hairy state of 7. crispum, and seems to have been so con- 
sidered by its discover, Sir Robert Schomburgk, whose speci- 
mens of British Guiana, distributed under n. 442, have been 
considered, by a very able closet-botanist, to include three dis- 
tinct species ? 
Prats 27. Fig. 1 and 2. Fertile ag of Trichomanes crispum,—natural 
size. 8. Fertile pinna,—magnified. 4. Sorus,—more highly magnified. 
