Aspidium
a genus of ferns belonging to the order polypodiaceæ. There are 10 British species. Some have orbicular eniform involucres fixed by their sinuses, while others have orbicular and peltate involucres. To the former, sometimes former, called lastrea, belong the A. filix mas, or blunt; the A. spiculosum, or prickly toothed; the A. oreopteris, or heath; and the A. thelypteris, or marsh shield fern, with other species more rare; and to the latter, the A. lonchitis, or rough alpine; the A. lobatum, or close-leaved ASQUITH prickly; the A. aculeatum, or soft prickly; the A. angulare, or angular-leaved shield fern.
ASPINWALL. See COLON.