2. The Ferns of Easter Island. 



By 



CARL CHRISTENSEN and CARL SKOTTSBERG. 



With 3 text figures. 



The present collection was made by the undersigned, assisted by Mrs. 

 SKOTTSBERG, during the Swedish Expedition to the Pacific, 1916— 17. We 

 spent the later half of June, 191 7, on Easter Island (Isla de Pascua). Before 

 our visit, only one representative collection 1 seems to have been made on the 

 island, by Mr. F. FUENTES of the Museo Nacional in Santiago, 191 1; this was 

 kindly put to my disposal in the said Museum. A list of Mr. FUENTES' ferns 

 was published by C. M. HiCKEN: Contribucion al Estudio de las Pteridofitas 

 de la Isla de Pascua i descripcion de dos nuevas especies (Kol. Mus. Nac. 

 Chile V: 1, 19 1 3) ; also in Rev. Chil. Hist. Nat. XVII (1913). The ferns were 

 also included in FUENTES' Resena botanica sobre la Isla de Pascua (Inst. Centr. 

 Meteor, y Geofis. de Chile no. 4, 191 3 and Bol. Mus. Nac. Chile V: 2, 191 3). 

 FUENTES' list contains three species, not mentioned by HiCKEN, Asplenium 

 obtusatum, Dryopteris parasitica and Polystichum aculeatum; Mr. Hicken, con- 

 sequently, did not receive specimens of these. We did not find P. aculeatum 

 or any allied species, nor were there any specimens of it in the collection 

 shown to me by Mr. FUENTES. 



In the short list of plants communicated by Hemsley (Report Challeng. 

 Bot. I: 15) no fern figures. 



Dr. CHRISTENSEN kindly undertook to revise our collection and the new 

 forms described are due to him. 



A map of the island, showing the localities quoted, is published in Vol. 

 I, No. 1. — Altitudes in meters above sea level. 



An* before a name signifies an addition to the flora. 



The numbers in brackets refer to our collection. 



C. Skottsberg. 



Polypodiaceae. 

 Asplenium L. 

 *i. A. adiantoides (L.) C. Chr. Ind. 99 var. squamulosum nov. var. 



A forma typica differt: foliis utrinque ad rachidem venasque dense 

 paleaceis; paleis rhachidis fuscis, venarum minutis, e basi lata fimbriata subito 

 in apicem subulatum angustissimum contractis. 



1 Nothing has been published on the »Albatross» collection (Agassiz a. o.). 



