Polystichum Aculeatum, Both. 
Aspidium Aculeatum and Lobatum, Smith. 
PRICKLY FERN. 
Root —Radicles long and wiry, caudex large and tufted. 
Frond —Erect, narrow, lanceolate, bipinnate; of a darker 
green than P. Angulare. 
Stipes —Short, thickly clothed with large chaffy scales. 
Pinnae —Pinnate, lanceolate, alternate. 
Pinnules —Ovate-lanceolate, spinous at the apex, margin 
acute; the superior basal pinnule larger than the rest, and 
auricled; all at an acute angle with the common stalk. 
Venation —Lateral veins alternate, forked, terminating 
in the serratures. 
Fructification —Clusters of capsules upon the anterior 
branch of the vein. 
Habitat —Common in woods and lanes. 
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