Asplenium Adiantum-Nigrum, Linn . 
BLACK SPLEENWORT. 
Root — R adicles long, black, and wiry ; caudex tufted. 
Frond — Elongate-deltoid, bipinnate. 
Stipes — As long as the frond, of a dark purple hue. 
Principal rachis winged. 
Pinnae — Triangular, alternate, pinnate ; apex often acute. 
Pinnules — Triangular, pinnatifid, bluntly or sharply ser- 
rated ; those in the lower pinnse sometimes pinnate. 
Venation — Lateral veins alternate, branched. 
Fructification — Lines of capsules on the forked veins, 
which, after the bursting of the involucre, become con- 
fluent. 
Habitat — In fissures of rocks and on walls, and on well- 
drained rocky slopes and banks. 
Locality — About Matlock, Buxton, and other places. 
♦ 
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