Northeastern Asian Flora
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Pteridium aquilinum   (redirected from: Pteridium aquilinum subsp. japonicum (Nakai) A.L?e & D.L?e)
Family: Pteridaceae
[Pteridium aquilinum subsp. japonicum (Nakai) A.L?e & D.L?e, morePteridium latiusculum (Desv.) Hieron., Pteridium latiusculum subsp. japonicum (Nakai) Fraser-Jenk., Pteris aquilina L., Pteris lanuginosa Spreng., Pteris latiuscula Desv.]
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  • Japan Flora
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Japan Flora: Fronds coarse, deciduous; rhizomes long-creeping, terete, 4-5 mm. across, remotely leafy, usually with pale brown jointed hairs at the tip; stipes 20-80 cm. long, rather stout, pale green, glabrous above, with soft hairs at the dark brownish base; blades broadly ovate-triangular, 20-100 cm. long, 17-70 cm. wide, short-acuminate, green above, slightly paler beneath, usually ternate-pinnate, the rachis sulcate and pubescent on upper side especially in the axils at base of pinnae, pale green; pinnae of the lowest pair manifestly larger than the others, reaching 2/3 of the entire length of the blade, spreading, 2- to 4-pinnati- parted, triangular-ovate, acuminate; pinnules subcoriaceous to thick-chartaceous, horizontally spreading, straight, oblong to linear-lanceolate, 3-6 mm. wide in the fertile, 5-8 mm. wide in the sterile ones, obtuse, usually glabrous above, thinly white- pilose at least along the costas beneath, slightly recurved on margins; sori marginal, continuous; indusia scarious, glabrous or nearly so, narrow.  Aug.-Oct. Sunny slopes in hills and mountains.

Hokkaido, Honshu, Shikoku, Kyushu; very com­mon.  Ryukyus, China, Korea, Sakhalin, s. Kuriles, Kam­chatka to Europe, and e. N. America

Pteridium aquilinum
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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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