Etymology Tokyoensis is the Latinization of the city in Japan, Tokyo.

Description Rhizome: short, thick, erect, also branching infrequently, scaly.
Frond: 90 cm high by 20 cm wide, deciduous, monomorphic, blade/stipe ratio: 6:1.
Stipe: grooved, green to purple, adjacent fronds exhibiting a variety of shades, scales lanceolate to long-ovate, abruptly acuminate, to 1.5 cm, membranous, brown, often darker in basal portion, vascular bundles: 3-7 in a c-shaped pattern.
Blade: 1-pinnate, but in some specimens the pinnae pass over the line from lobed to pinnatifid, oblanceolate, widest above the middle, herbaceous to somewhat leathery, scales on rachis lanceolate to linear.
Pinnae: 25 to 35 pair, shallowly lobed to pinnatifid, the lowest pair much reduced; the proximal lobe enlarged, ear-like; veins simple, immersed on top surface.
Sori: round, 1 per lobe of the pinna, medial, indusium: reniform, at a sinus, sporangia: brownish.

Culture Habitat: sunny or half-shaded wetlands. Distribution: China, Japan, Korea. Hardy to -25�C, USDA Zone 5.

Distinctive Characteristics Among the slenderest, most upright�of fronds, the blade stipe ratio also distinctive, and the auricled pinnae.

Synonyms
Nephrodium tokyoense Matsum. ex Makino
Aspidium transitorium Christ