POLYPODIACE^. 267 



Hab. Ovolau, Feejee Islands : on moist rocks and trees, at the ele- 

 vation of 2,000 feet. 



Plant very abundant in the above localities. Eootstock setose. 

 Stipes 3 inches and upwards in length, slender, smooth, terete. 

 Fronds usually about the same length as the stipe, elastic, broad- 

 ovate, contracting into an acuminate point, pinnate, at least near the 

 base, where the main rhachis is occasionally slightly margined, and 

 usually with the secondary rhachis a little flexuose. Pinnm alternate, 

 spreading, ovate-oblong; the inferior ones distant and ti-ipinnatifid ; 

 the superior bipinnatifid ; the lacinioe short, narrow-linear, obtuse, sjn- 

 nulose-dentate. Rhachis flexuose, margined towards the upper portion. 

 Sori few, confined to the upper half of the frond, and situated either 

 on short supra-axillary lacinise, which is their usual position, or on 

 the points of the outer lacinise. Indusium small, ovate, and split into 

 two valves almost to its base, which is slightly immersed in the 

 lacinia, the upper half of the valves sharply serrated. Receptacle 

 included. 



In habit and general characters this stands near to H. bivalve, 

 Swartz; but it differs from that species in its slightly margined 

 rhachis, and the sharply serrated indusium. 



Plate 37. — Fig. 2. Plant, of the natural size. 2 a. Portion of a 

 frond, seen from beneath. 2 b. View of a sorus, with one-half of the 

 indusium removed. 2 c. Sporangia. — The details more or less mag- 

 nified. 



11. Hymenophyllum tortuosum, Banks & Soland. 



HymenopTiyllum, tortuosum, Banks & Soland. j Hook. & Grev. Ic. Fil. t. 129 ; Hook. 

 Spec. Fil. 1, p. 99. 



Hab. Orange Harbour and Good Success Bay, Tierra del Fuego : 

 very abundant on mossy and shady banks, and occasionally creeping 

 up the trunks of trees. Remarkable on account of the tortuous 

 nature of the wings on the stipe and rhachis. 



