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P. tsus-simense resources
brief accountbrief account
brief accountbrief account
Flora of JapanFlora of Japan
inoperativefrond (link inoperative)
Polystichum tsus-simense var.mayebaraePolystichum tsus-simense var.mayebarae
inoperativescan: entire plant (link inoperative)
Photo index
PlantSystematics.org, diagnostic photosPlantSystematics.org, diagnostic photos

All Ferns
     acrostichoides  aculeatum
     andersonii  braunii
     craspedosorum  imbricans
     kruckebergii  lemmonii
     lepidocaulon  lonchitis
     makinoi  munitum
     neolobatum  polyblepharum
     proliferum  retroso-paleaceum
     rigens  scopulinum
     setiferum  setigerum
     tagawanum  tripteron
     tsus-simense  xiphophyllum

 Other Genera
    Adiantum  Arachniodes
    Aspidotis  Asplenium
    Astrolepis  Athyrium
    Blechnum  Cheilanthes
    Cryptogramma  Cyrtomium
    Cystopteris  Dennstaedtia
    Deparia  Diplazium
    Dryopteris  Gymnocarpium
    Lygodium  Matteuccia
    Onoclea  Oreopteris
    Osmunda  Pellaea
    Phegopteris  Pleopeltis
    Polypodium  Pteridium
    Pteris  Pyrrosia
    Thelypteris  Woodsia
Polystichum tsus-simense (Hook.) J. Sm.

Korean rock fern

Etymology Of Tsu-shima, Japan.
Description Rhizome: erect, short, scales broadly lanceolate, brown, often with blackish central portion, to 1 cm long, with irregular .
Frond: 45 cm high , evergreen, monomorphic , blade/stipe ratio: 3:2.
Stipe: grooved, scales at base similar to those on rhizome, those on upper portion narrowly lanceolate to linear, dark brown to blackish, continuing on the rachis, vascular bundles: 4 or more, in an arc.
Blade: 2-pinnate, lanceolate, glossy, linear to lanceolate scales below, no hairs.
Pinnae: 15 to 20 pair, lowest pinnae bending forward and downward; margins shallowly crenate, spiny; veins free, forked, black.
Sori: round, in 1 row between midrib and margin, indusium: peltate, attached centrally, shriveling, sporangia: dark brown.
Culture Habitat: slopes or rocky places in forests, often near streams. Distribution: China, Japan, Korea, Thailand, Indochina. Hardy to -20C, USDA Zone 6.
Aspidium tsus-simense Hook.
Polystichum monotis Christ
Polystichum tsus-simense
Polystichum tsus-simense. 1) frond, 2) crozier, 3) sterile pinna with larger basal pinnule, 4) fertile pinnule, 5) scaly stipe, 6) enlarged stipe scale.  Illustration from Ferns to Know and Grow by F. Gordon Foster, 1964.
Subtaxa var. mayebarae (Tagawa ) Sa. Kurata is a larger plant and the one now in the trade. Reports of other differences are conflicted. Sometimes regarded as a separate species.
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