劲直阴地蕨 jin zhi yin di jue

Botrypus strictus (Underwood) Holub; Japanobotrychum strictum (Underwood) M. Nishida ex Tagawa; Osmundopteris stricta (Underwood) M. Nishida.

Plants summer-green. Rhizomes erect, short, cylindrical. Fronds 30-70 cm tall. Sterile lamina: stalk 15-25 cm, up to 1 cm in diam., fleshy; lamina subternate, bi- or tripinnatifid, dull green, broadly pentagonal; pinnules sessile, narrowly oblong, base decurrent to costal wing; ultimate segments elliptic, dentate, apex rounded; costae and costules beneath sparsely lanuginose. Sporophore arising at top of common stipe, as long as sterile lamina; lamina bipinnate, spikelike; pinnae short; sporangia ellipsoid-globose, each on tip of short but distinct ultimate axes or veins. Spore surface coarsely verrucose. 2n = 88, ca. 90.

Forests. Chongqing, Gansu, Heilongjiang, Henan, Hubei, Jilin, Liaoning, Nei Mongol, Shaanxi, Sichuan [Japan, Korea].