Hardy Fern Home

Dennstaedtia resources
Flora
Flora of North AmericaFlora of North America
Taxonomy
also distributionalso distribution

All Ferns
  Dennstaedtiaceae
   Dennstaedtia
     punctilobula

 Other Genera
    Adiantum  Arachniodes
    Aspidotis  Asplenium
    Astrolepis  Athyrium
    Blechnum  Cheilanthes
    Cryptogramma  Cyrtomium
    Cystopteris  Deparia
    Diplazium  Dryopteris
    Gymnocarpium  Lygodium
    Matteuccia  Onoclea
    Oreopteris  Osmunda
    Pellaea  Phegopteris
    Pleopeltis  Polypodium
    Polystichum  Pteridium
    Pteris  Pyrrosia
    Thelypteris  Woodsia
    Woodwardia
 
Dennstaedtia Bernhardi (Dennstaedtiaceae) Earlier placement: Polypodiaceae, Hypolepidaceae

Cup fern

Etymology Named for the German botanist, August Wilhelm Dennstaedt (1776-1826).
Description Rhizome: long-creeping, hairs dark reddish brown, jointed.
Frond: deciduous, monomorphic.
Stipe: straw-colored to brown, darker at base, grooved above, pubescent with soft, jointed hairs, vascular bundles: 1 arranged in a U-shape.
Blade: 2-pinnate-pinnatifid, less and more also, lanceolate, lacy, papery, yellow-green to pale green, indument of silver-gray, jointed hairs on both surfaces, gland tipped hairs below.
Pinnae: broadest at the base, segments ovate to lanceolate, margins serrate-crenate, veins free, pinnately branched.
Sori: globose to almost cylindric, marginal at vein tips, indusium: formed by fusion of inner and outer laminar flaps to form a circular cup.
Dennstaedtia
Dennstaedtia. Sori here are less than 2 mm, with cup-like indusia constructed partly from the margin, partly from the lamina.  Photo by Rod Tulloss, Environmental Commission of the Borough of Roosevelt and the Fund for Roosevelt, Inc.
Valid XHTML 1.0     Reports of errors and omissions appreciated: toms AT hardyfernlibrary.com (please replace the AT with @)