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X. L'mJfaaj a new Genus of Ferns. By Jonas Dryander^ M. A. 

 L'tbr. R. S. and F. L. S. 



Read November 4, 1794. 



'T^HE ferns belonging to this genus have fo much the habit of 

 -■- Ad'iantum, that M. Aublet and Profeflbr Swartz have referred 

 to that genus the fpecies difcovered by them, though they ought, 

 according to the generic charadlers of Linnseus, to have been re- 

 ferred to Fterh. In examining the Fdices dorjifera in Sir Jofeph 

 Banks's herbarium, for the purpofe of inveftigating the membranes 

 which cover the fru£lifications, I foon difcovered a great difference 

 between thcfe fuppofed Adianttms and the genera of Ad'wntum and 

 Pter'is. In Adiantum the fru6lifications, being diftinft fpots, are 

 covered by lunular membranes attached to the margin of the frond 

 and open towards the difk; in Pterls the frudifications form a line 

 along the margin of the frond, and are covered by a linear membrane 

 faftened to the margin of the frond, and open towards the difk ; but 

 in this genus the fruftifications form a line parallel with the margin 

 of the frond ; in feme fpecies clofe to it, in others more or lefs 

 remote from it; but in all, the covering membrane is attached to 

 the diflc within the line of fru6lifications, and opens towards the 

 margin of the frond. 



1 have named this genus from Mr. John Lindfay, an affiduous 



and 



