52 CARL CHRISTENSEN AND CARL SKOTTSBERG 



Hab. Eastern headland, Vaintu Rova and Tea-tea, humid fissures, not 

 rare (no. 654); Rano Aroi, fairly common; Rano Kao, stone-heaps near the 

 lake, c. 125 m (no. 673), but also seen higher up. — Fertile. 



This common Polynesian fern varies in the island as in most other loca- 

 lities greatly in size and division, the leaves now being entire, now trifid or 

 pinnatifid with several pair of segments, which are longer or shorter, acute or 

 obtuse. P. Fuentesii is one of the larger forms, but certainly not distinguish- 

 able even as variety. Typical Fuentesii is in the collection. 



Area of distribution: The tropics of the Old World, including Austra- 

 lia and Polynesia. 



Vittaria J. Sm. 



10. V. elongata Sw. — Syn. V. costata Hicken Bol. 137, Rev. 96, 

 )ion Kunze. 



Hab. In fissures between blocks, with moss, in the craters of Rano Aroi, 

 c. 420 m and Rano Kao, c. 125 m. (no. 672), in the last mentioned also in 

 the moss peat of the crater lake. — Fertile. 



This very common Polynesian species is totally different from the Ame- 

 rican V. costata Kze, to which HiCKEN referred specimens from the island. 



Area of distribution: Tropical Asia, Polynesia, N. S. Wales. 



Ophioglossaceae. 

 Ophioglossuni L. 



*n. O. reticulatum L. 



Probably not uncommon in short grass on the plains and slopes. 



Hab. West slope of Mt Katiki (no. 11S4); near the landing-place in 

 Hanga Ho Orno (no. 648); near Mataveri; also seen in the centre of the 

 island. — Fertile. — Not recorded before. 



Area of distribution: Tropical Africa and America; Polynesia. 

 *I2. O. coriaceuni A. Cunn. 



Hab. With the preceding, slope of Mt Katiki (no. 651), and at Hanga 

 Ho Orno. — Fertile. — Not recorded before. 



We have some doubt of this being the true 0. coriaceum A. Cunn.; 

 it certainly belongs to 0. coriaceum Prantl, Mon. Ophiogl. 314 tab. 7 fig. 9, 

 10, 15; on the other hand, it falls under 0. vulgatum var. australasicuni Luerss. 

 Mus. -Godeffr. 3: 246, corresponding closely to his fig. 73. PRANTL refers 

 LUERSSEN's variety to O. pcdunculosum; to this species our specimens certainly 

 do not belong. 



Area of distribution: Australia, Tasmania, New Zealand; Easter Island; 

 Bolivia. 



