study, in no way promotes a natural arrangement. ‘The plant 
now under consideration, with the venation of Campteria, is own 
brother in habit and structure to Péeris (Litobrochia) Brasiliensis, 
Raddi, and ought always to rank next to it: Fée and J. Smith 
have gone so far as to abandon Campteria. There is indeed a 
true Pieris (Eupteris) gracilis of Fée (see our Sp. Fil. v. 2. p. 
172. t. 128 a.) also from Brazil, so closely resembling this that 
I doubt if it is even specifically distinct. 
Prate 23. Fertile plant of Pleris (Litobrochia ?) leptophylia, Sw.,—natural 
size. Fig. 1. Fertile pinnule,—magnified. 2. Portion of a sorus,—more mag- 
nified. 3. Sterile pinna,—natural size. 4. Portion of a pinnule, showing the 
venation of Campteria,—magnified. 
