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D. crassirhizoma resources
Flora
Flora of JapanFlora of Japan
Monograph
Hoshizaki and WilsonHoshizaki and Wilson
Photo
CalPhotosCalPhotos
inoperativefour diagnostic close-ups (link inoperative)
habithabit
standard view of habitstandard view of habit
two amazing shotstwo amazing shots
Photo index
PlantSystematics.org, diagnostic photosPlantSystematics.org, diagnostic photos

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 crassirhizoma Nakai
Etymology From the Latin Crassus, thick + the Greek rhizoma, mass of roots. But remember that a rhizome is an underground stem.
Description Rhizome: stout, 10 cm across, erect, bearing more than ten ascending fronds in a beautiful whorl, scales lanceolate to linear, larger ones more than 4 cm long.
Frond: 100 cm high by 20 cm wide, deciduous, monomorphic, blade/stipe ratio: 4:1.
Stipe: grooved, straw colored, densly scaly, lanceolate to linear, brown, lustrous, vascular bundles: 3-7 in a c-shaped pattern.
Blade: almost 2-pinnate, deltate-ovate to lanceolate, widest at the middle, herbaceous , linear to ovate scales below, absent above.
Pinnae: catadromous; costae grooved above, continuous from rachis to costae; segments oblong, rounded; margins crenate; veins free, forked, immersed on upper surface.
Sori: round, confined to upper pinnae, indusium: reniform, at a sinus, sporangia: brownish.
Culture Habitat: wooded slopes. Distribution: Japan, Korea, Manchuria, ne Asia. Hardy to -25C, USDA Zone 5.
Synonyms
Dryopteris filix-mas (L.) Schott, misapplied
Dryopteris buschiana Fomin
Dryopteris setosa Kudo
Dryopteris crassirhizoma
Dryopteris crassirhizoma. Perfectly symmetrical crown.  Photo: Tom Stuart
Notes
Persistence Another report: evergreen (Mickel, Ferns for American Gardens)
Dryopteris crassirhizoma
Dryopteris crassirhizoma. Fertile pinna: more detail on the click-through.  Photo: Tom Stuart
Dryopteris crassirhizoma
Dryopteris crassirhizoma.  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.
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