Northeastern Asian Flora
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Cystopteris fragilis (L.) Bernh.  
Family: Aspleniaceae
[Aspidium fragile Sw., moreCyclopteris fragilis (L.) Gray, Cystea fragilis (L.) Sm., Cystopteris baenitzii Dorff, Cystopteris dickieana Sim, Cystopteris filix-fragilis (L.) Gilib, Cystopteris remotipinnata Ching, Cystopteris sikkimensis Ching ex Bir, Polypodium fragile L.]
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  • Japan Flora
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Japan Flora: Rhi­zomes short-creeping, densely covered with the basal stubs of old stipes; fronds deciduous; stipes 3-10(-18) cm. long, tufted, straw-colored, brown and rather densely scaly at base; scales broadly lanceolate to linear, acuminate, pale brown, entire; blades thinly membranous, oblong to oblong-ovate, 7-18 cm. long, 2-6 cm. wide, acuminate to acute, bipinnatiparted to bipinnate, not broadened at base, nearly glabrous; pinnae ovate to broadly lanceolate, sometimes the lowest deltoid-ovate, 6-12 mm. wide, acute to obtuse, short-petiolulate; pinnules oblong to obovate, 3-8 mm. long, 2-4 mm. wide, obtuse, sessile, usually more or less decurrent on posterior side at base, few-toothed to lobulate; veinlets not reaching the mar­gin; sori on upper portion of the simple veinlets; indusia thinly membranous, whitish, nearly orbicular to ovate-lanceo­late.                

Hokkaido, Honshu (centr. and n. distr.), Shikoku (Mount Tsurugi in Awa Prov.). Sakhalin, Kuriles, Korea, Formosa (alpine), and the colder regions and mountains of the N. and S. Hemispheres.

Cystopteris fragilis
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Development supported by College of Agriculture and Life Sciences of Seoul
National University and Korea National Arboretum of Korea Forest Service.
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