POLYPODIACEiE. 229 



tion. 1 b. Same view of a portion of the fertile frond, showing the 

 form of the indusium. 1 c. Single sorus, with the indusium cut 

 away, to show the insertion of the sporangia. 1 d. Scale from the 

 rootstock. 1 e. Sporangium. — The details more or less magnified. 



3. HlTMATA PECTIN ATA, J. Sm. 



Humata pectinata, J. Sm. in Lond. Jour. Bot. 1, p. 425. 



Davallia pectinata, Sw. Syn. Fil. p. 130; Willd. Spec. PL 5, p. 465; Hook. & 

 Grev. Ic. Fil. t. 139 ; Hook. Spec. Fil. 1, p. 153 (subgen. Humata). 



Hab. Tahiti, Society Islands : in mountain forests, on the trunks 

 of trees. 



The figure given in the Icones Filicum represents the usual state 

 of the plant ; but we possess specimens of nearly twice the size, and 

 with the inferior pinnae deeply pinnatifid, the superior ones incisely 

 serrate. 



4. Humata parallela. 



Davallia parallels, Wall.; Hook. Spec. Fil. 1, p. 153, t. 42, A. (subgen. Humata). 

 Nephrodium Gaimardianum, Gaud. Bot. Freyc. Yoy. p. 335, t. 12, f. 1. 



Hab. Samoan Islands : on rocks and trunks of trees. 



We find the sterile and fertile fronds, in all our examples of the 

 plant, to be uniform in size. In the Species Filicum the sterile frond 

 is represented as much the larger; which goes to show that the 

 species is subject to variation in this particular. The species is nearly 

 aUied to the preceding, but is readily distinguished by the less 

 deltoid fronds, not so deeply pinnatifid, with more approximate and 

 parallel segments, the indusium pointing to the extremity of the seg- 

 ments, a character clearly pointed out by Sir William Hooker in 

 his Species Filicum. The Nephrodium Gaimardianum of Gaudichaud, 

 which is identically the same as our plant, is stated by that author to 

 be a native of the Sandwich Islands, in which he is followed by Sir 

 William Hooker ; but our own observations, as well as those of others 



58 



