1 70 Dr. J. D. Hooxer’s Enumeration of the Plants 
35. A. MARINUM, L., var. auriculatum ; fronde ovato-lanceolatà pinnata, pinnis 
petiolatis lineari-oblongis obtusis crenatis basi cuneatis sursüm auricu- 
latis. 
Hab. Charles and James Islands, Charles Darwin, Esq. 
A very common South American plant, which I feel little hesitation in 
referring to 4. marinum. The narrower pinne, 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 4. marinum of 
New Brunswick in Canada; while some states of the plant from Staffa ex- 
hibit rhomboid or nearly orbicular pinne. In others, from the Galapagos, 
the pinna, 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 pinne become longer and gradually atte- 
nuated, when the plant is hardly to be known from .4. auritum, Sw. 
36. A. NIGRESCENS, Hook. fil.; fronde elongata pinnata, pinnis petiolatis ovato- 
v. lineari-lanceolatis acuminatis preesertim ad apices crenato-dentatis 
superne obliquis basi cuneatis; terminali majusculà basi sublobatà, soris 
brevibus obliquis oblongo-ellipticis, stipite rachique glaberrimis. 
Hab. James Island, Charles Darwin, Esq. 
Frons bipedalis. Stipes rachisque glaberrimi, nitidi, validi, anticé canaliculati. Pinna 
remote, 3 unc. longz, j-$ late, membranacez, siccitate nigrescentes, plus minusve 
serrato-dentate, dentibus angustis obtusis versus apices explanatis basi cuneatis. Sori 
15-30 quávis pinná, breves 4 lin. longi, costae subapproximati. Indusia membranacea, 
oblonga. 
Near A. salicifolium, 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 4. 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, Willd.). 
Hab. James Island, Charles Darwin, Esq. Also found in all the warm districts of South 
America and the West Indies. 
