gleicheniace^e. 297 



* * * * Stipes repitito-di-trichotomus ; pinnis bijugis, pari injimo minori e basi dicho- 

 tomorum, segmentis haud decurrentibus. 



12. Mertensia dichotoma, Willd. 



Mertensia dichotoma, Willd. Spec. PI. 5, p. 71; Sw. Syn. Fil. p. 163; Gaud. Bot. 



Freyc. Voy. p. 301. 

 Gleichenia Hermanni, K. Br. Prodr. Fl. Nov. Holl. p. 161. 

 G. dichotoma, Hook. Spec. Fil. 1, p. 12. 



Hab. Feejee Islands. Tahiti, Society Islands. Sandwich Islands. 

 Singapore. 



Several forms of this species occur in the herbarium of the Expe- 

 dition. In one from Tahiti, the pinnae terminate in a caudate entire 

 point, from 2 to 3 inches in length ; and the segments are a little 

 falcate, and longer than in any other form. The plants from New- 

 Zealand, the Feejee Islands, and the single specimen from Tahiti 

 are very much alike : they are slender in their habit, the pinnae very 

 glaucous beneath, and the segments rather short. In the Sandwich 

 Island form, the branches are short and broad-lanceolate, with emar- 

 ginate segments, slightly glaucous and glabrous beneath. 



13. Mertensia Klotzschii. 



Gleichenia Klotzschii, Hook. Spec. Fil. 1, p. 13, t. 5, B. 

 Hab. Vicinity of Rio Janeiro, Brazil. 



So closely does this resemble some of the forms of the preceding, 

 that it scarcely merits to rank as a distinct species ; differing only in 

 the upper side of the pinnae being of a more livid green, and in the 

 presence on the under surface of ferrugineous entangled hairs. 



14. Mertensia emarginata, Sp. Nov. (Tab. 42.) 

 M. stipite Icevi tereti di-tricJiotomo, divlsiGnibus uliimis nnijugis cum 



75 





