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FNA | Family List | FNA Vol. 2 | Dennstaedtiaceae

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.

1 Blades yellow-green or pale green, mostly 2-pinnate-pinnatifid, leaves usually less than 1 m.   1 Dennstaedtia punctilobula
+ Blades dark green, 3-pinnate, leaves 1–2(–3) m.   (2)
2 (1) Basal segments of pinnules alternate; blades dull; indusia globose; Texas.   2 Dennstaedtia globulifera
+ Basal segments of pinnules opposite; blades lustrous; indusia tubular or cylindric; Florida.   3 Dennstaedtia bipinnata

Lower Taxa


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