Plate 33. 
ASPLENIUM Adiantum-ntgrum, L. 
Black Spleenwort. 
Asplenium Adiantum-nigrum ; caudex stout (when old thickly clothed with the 
remains of former stipites), horizontal or ascending; stipites densely tufted, 
castaneous, generally ebeneous at the base, often a span and more long; 
fronds a span to a foot and more long, ovate or ovate-oblong, acuminate, 
firm, membranaceo-coriaceous, glossy, bi-tripinnate; primary pinnae petio- 
late, ovato-acuminate; secondary also petiolate ; tertiary usually sessile, 
from a cuneate base ovate or oblong or lanceolate or even linear, more or 
less acuminate, but not sharply, rarely very obtuse, inciso-pinnatifid, the 
lobes coarsely and subspinulosely serrated; veins pinnated, erecto-patent; 
sori copious, approximate, linear-oblong, at length confluent; involucres 
firm, membranaceous, pale-brown, entire ; rachises alate. 
Asplenium Adiantum-nigrum. Linn. Sp. PI. p. 1541. Sw. Syn. Fit. p. 84. 
mild. Sp. PI. v. 5 .p. 346. Schk. Fil. p. 74. t. 80 «. Png. Pot. t. 1950. 
8m. Png. FI. v. 4. p. 310. Hook, and Am. Brit. FI. ed. 8. p. 590. Metten. 
Asplen. p. 144. Moore , Brit. Ferns , Nat. Print, t. 36. Hook. Sp. Fil. 
v. 3 .p. 187. 
Asplenium Oreopteris. Linn. Sp. PI. ed. 1 . p. 1081 ( according to Moore , but 
Mettenius refers this to the var. acutum). 
Asplenium argutum. Klfs. En. Fil. p. 176. 
Asplenium humile. Bl. Pn. Fil. Jav. p. 185 ( according to Presl and Moore, 
while Blume compares it with Aspl. pumilum, a West Indian species). 
Asplenium Silesiacum, Milde. A. nigrum, Bernh ., A. luridum, Salisb., and A. 
Capense, L., are generally referred hither. 
0. acutum, Pollin; pinnae, pinnules, and segments narrower, often linear, acute 
or acuminate. Moore, Brit. Ferns. Nat. Print, t. 37. 
Asplenium acutum. Bory in Willd. Sp. PI. v. 5. p. 347. 
Asplenium productum. Lowe, Trans. Carnbr. Phil. Soc. v. 6 .p. 524. 
y. obtusum, Moore; pinnules and lobes very broad, more acutely dentate. 
Asplenium obtusum. Kit. in Willd. Sp. PI. v. 5. p. 341. 
Asplenium Adiantum-nigrum, var. Capense, Schlecht. Adumbr. Fil. Cap. p. 31. 
t. 18 {excellent). 
Asplenium cuneifolium. Vis. FI. Ital. Fragm.p. 16. t. 18. 
Asplenium Serpentini. Tauscli and Henjl. Aspl. Pur op. p. 1. t. 1. 2. 
(To this form Mr. Moore refers A. fissum, Weinm., A. Forsteri, and A. 
novum, Sadi., A. incisum, Opitz, A. multicaule, Scholtz, and A. tabulare, 
Schrad.—There is enumerated in our ‘ Species Filicum,’ the var. 8 Gaudi- 
chaudianum, Hook., which is the Aspl. patens of Gaudich. in Freyc. Yoy. Hot. 
p. 320, A. Adiantum-nigrum of Brackenr. and of Metten.). 
Hab. The normal form from which y obtusum is very little distinct, is very common 
on shady banks, walls, and fissures of rocks, throughout Great Britain. 0 is 
