Hardy Fern Home

D. stewartii resources
Monograph
Hoshizaki and WilsonHoshizaki and Wilson

All Ferns
  Dryopteridaceae
   Dryopteris
     aemula  affinis
     amurensis  arguta
     bissetiana  campyloptera
     carthusiana  caucasica
     celsa  championii
     clintoniana  crassirhizoma
     cristata  cycadina
     cystolepidota  decipiens
     dilatata  erythrosora
     expansa  filix-mas
     formosana  fragrans
     fuscipes  goldiana
     hondoensis  intermedia
     kuratae  lacera
     lepidopoda  ludoviciana
     marginalis  mindshelkensis
     oreades  pacifica
     polylepis  pseudo-filix-mas
     purpurella  remota
     sacrosancta  saxifraga
     sieboldii  stewartii
     sublacera  tokyoensis
     uniformis  varia
     wallichiana

 Other Genera
    Adiantum  Arachniodes
    Aspidotis  Asplenium
    Astrolepis  Athyrium
    Blechnum  Cheilanthes
    Cryptogramma  Cyrtomium
    Cystopteris  Dennstaedtia
    Deparia  Diplazium
    Gymnocarpium  Lygodium
    Matteuccia  Onoclea
    Oreopteris  Osmunda
    Pellaea  Phegopteris
    Pleopeltis  Polypodium
    Polystichum  Pteridium
    Pteris  Pyrrosia
    Thelypteris  Woodsia
    Woodwardia
 
Dryopteris stewartii Fraser-Jenk.
Etymology Stewartii is named for John Stuart, Earl of Bute (1713-1792)
Description Rhizome: erect, branching.
Frond: 100 cm high by 35 cm wide, deciduous, monomorphic, blade/stipe ratio: 2:1 to 3:1.
Stipe: grooved, scales dark brown, vascular bundles: 3-7 in a c-shaped pattern.
Blade: 2-pinnate, lanceolate, herbaceous to somewhat leathery, linear to ovate scales below, absent above.
Pinnae: 20 to 22 pair, subopposite, lowest pinnae anadromic; pinnules slightly pinnatifid at the base, the first lower pinnule of the lowest pinnae slightly longer than the upper pinnule, basal pinnules stalked; costae grooved above, continuous from rachis to costae; margins spiny; veins free, forked.
Sori: round, 1-2 mm, medial, on both sides of the costule, indusium: reniform, tan, at a sinus, sporangia: brown to black, maturity: late spring to summer.
Culture Habitat: in forests at mid to high elevations. Distribution: Himalayas: Afghanistan, Pakistan, India, Nepal. Hardy to -20C, USDA Zone 6.
Synonyms
Dryopteris odontoloma f. brevifolia Mehra & Khullar
Dryopteris stewartii
Dryopteris stewartii.  Illustration from The Cultivated Species of the Fern Genus Dryopteris in the United States, Barbara Joe Hoshizaki and Kenneth A. Wilson, American Fern Journal, 89, 1, (1999), with permission.
Dryopteris stewartii
Dryopteris stewartii. Pinnules, 15 June, the first maturing fronds. Click for the entire pinna.  Scan: Tom Stuart
Dryopteris stewartii
Dryopteris stewartii. Habit: spreading, lowest pinnae bending forward above the plane of the frond.  Photo: Tom Stuart
Valid XHTML 1.0     Reports of errors and omissions appreciated: toms AT hardyfernlibrary.com (please replace the AT with @)