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P. tsus-simense resources
Descriptive
brief accountbrief account
brief accountbrief account
Flora
Flora of JapanFlora of Japan
Photo
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

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     neolobatum  polyblepharum
     proliferum  retroso-paleaceum
     rigens  scopulinum
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     tagawanum  tripteron
     tsus-simense  xiphophyllum

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    Pteris  Pyrrosia
    Thelypteris  Woodsia
    Woodwardia
 
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.
Synonyms
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.
Notes
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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