POLYPODIACE^. 251 



5. Trichomanes tenue, Sp. Nov. (Tab. 36.) 



T. rhizomate gracili repmte; stipite gracili marginato; frondibus glabris 

 fkipcidis ovato-lanceolatis triplnnatipjartitis ; pinnis primariis alternis 

 patentibus; laciniis angmto-linearibus obtusis, ultimis bifidis; indusio 

 supra-axillari prorsus immerso cylindrico basi attenuate*, ore patente 

 vix bilabiato; receptaculo setaceo, indusium bis superante. 



Hab. Tahiti, Society Islands : in mountain forests, on trees. 



The rootstock of this is slender and creeping. Stipe about an inch 

 long, with a narrow margin of half a line in breadth. Fronds smooth, 

 flaccid, 3 to 4 inches in length, of an ovate-lanceolate form, deeply 

 thrice pinnatifidly divided; the primary divisions alternate and spread- 

 ing. Lacinio3 very narrow-linear, finely reticulated ; the ultimate ones 

 short and bifid; the fructiferous ones broadest. Rhachis somewhat 

 flexuose, about as broad as the lacinias. Indusium immersed its ivlwle 

 length in a short supra-axillary lacinia, usually close to the main 

 rhachis, cylindrical, with an attenuated base and a spreading mouth, 

 which is scarcely two-lipped. Receptacle slender, exserted about tivice the 

 length of the indusium. The whole plant is very graceful in its 

 growth, and apparently one not before described. 



Plate 36. — Fig. 2. Portion of a plant, of the natural size. 2 a. 

 Dorsal view of a portion of a frond, slightly magnified. 



6. Trichomanes pyxidiferum, Linn. 



Trichomanes pyxidiferum, Linn, ex Sw. Syn. Fil. p. 143 ; Willd. Spec. PL 5, p. 

 508 ; Raddi, Plant. Brasil. p. 64 ? Hook. & Grev. Ic. Fil. t. 206 ; Hook. Spec. 

 Fil. 1, p. 124. 



Hab. Organ Mountains, Brazil : terrestrial. 



This is evidently the T. pyxidiferum, described by Swartz and 

 Willdenow, and we believe also that figured by Hooker and Greville, 



