1. Dennstaedtia Bernhardi, J. Bot. (Schrader). 1800(2): 124. 1802 [Named after A. W. Dennstaedt,. 1776.
[Named after A. W. Dennstaedt, 1826, German botanist]
Clifton E. Nauman
A. Murray Evans
Plants terrestrial, often forming colonies. Stems subterranean, long- to short-creeping; hairs dark reddish brown, jointed. Leaves clustered or scattered, erect to arching, ovate to lanceolate to deltate, 0.4--3 m. Petiole glabrous to pubescent, usually without prickles, often with stem buds near base; vascular bundles 1--2, arranged in U- or O-shape in cross section. Blade 2--4-pinnate; rachis without prickles; nectaries absent. Segments pinnately divided, ultimate segments ovate to lanceolate, margins dentate or lobed. Veins free, pinnately branched. Sori marginal at vein tips, distinct, round or cylindric; indusia formed by fusion of true indusium and minute blade tooth to form circular or slightly 2-valvate cup. Spores tetrahedral-globose, trilete (rarely monolete), tuberculate or ridged. x = 34, 46, 47.
Species ca. 70 (3 in the flora): worldwide, mostly tropical.
Tryon, R. M. 1960. A review of the genus Dennstaedtia in America. Contr. Gray Herb. 187: 23--52.