170 Dr. J. D. Hooker's Enumeration of the Plants 



35. A. MARiNUM, L., var. auriculatum ; fronde ovato-lanceolata pinnata, pinnis 

 petiolatis lineari-oblongis obtusis crenatis basi cuneatis sursum auricu- 

 latis. 



Hab. Charles and James Islands, Charles Darwin, Esq. 



A very common South American plant, which I feel little hesitation in 

 referring to J. marinum. The narrower pinnae, auricled at the base, and the 

 small size are the chief distinctions between this and the English form. One 

 of Mr. Darwin's specimens cannot be distinguished from the A. marinum of 

 New Brunswick in Canada ; while some states of the plant from StafFa ex- 

 hibit rhomboid or nearly orbicular pinnae. In others, from the Galapagos, 

 the pinnae, instead of being auricled at the upper base, are there deeply 

 divided down to the costa. In several of the fronds of the Guatemala, Colum- 

 bian and Caraccas specimens, the pinnae become longer and gradually atte- 

 nuated, when the plant is hardly to be known from A. auritum, Sw. 



36. A. NiGRESCENs, Hook.Jil.; fronde elongata pinnata, pinnis petiolatis ovato- 



V. lineari-lanceolatis acuminatis praesertim ad apices crenato-dentatis 

 supernfe obliquis basi cuneatis ; terminali majuscula basi sublobata, soris 

 brevibus obliquis oblongo-ellipticis, stipite rachique glaberrimis. 

 Hab. James Island, Charles Darwin, Esq. 



Frons bipedalis. Stipes rachisque glaberrimi, nitidi, validi, antice canaliculati. Pinnae 

 remotae, 3 une. longae, j-f latae, membranaceae, siccitate nigrescentes, plus minusve 

 serrato-dentatae, dentibus angustis obtusis versus apices explanatis basi cuneatis. Sori 

 15-30 quavis pinna, breves ^ lin. longi, costae subapproximati. Indusia membranacea, 

 oblonga. 



Near A. salicifoUum, L., but the upper base of the pinna, though rather 

 gibbous, is by no means lobed, and the sori are very unlike. It has also the 

 aspect of A. lucidum, Forst., the sori being however much shorter, and the 

 texture of the plant totally different. It is Mr. Gardner's n. 5942, from Rio, 

 and is probably a frequent though overlooked South American fern. 



37. Nephrodium pectinatum, Presl (Aspidium, JVilld.). 



Hab. James Island, Charles Darwin, Esq. Also found in all the warm districts of South 

 America and the West Indies, 



