Intermedia means being intermediate in color, form, or habit.
Rhizome: erect, short, scaly.
Frond: 25 cm high by 4 cm wide, deciduous, monomorphic, blade/stipe ratio: 2:1.
Stipe: straw-colored to brown, obliquely jointed at top, old stipe bases 1-2 cm., densely scaly at base, sparsely hairy and scaly throughout; scales lanceolate, pale brown, vascular bundles: 2, round or oblong.
Blade: 1-pinnate, narrowly lanceolate or linear, somewhat narrower at the base, herbaceous, soft, hairy on both surfaces, also scaly beneath, scales linear.
Pinnae: 4 to 12 pair, pinnae lanceolate or oblong-lanceolate, eared upwards at the base, 25 x 7 mm, upper pinnae adnate to the rachis; costae grooved above, grooves continuous from rachis to costae; margins undulate ; veins free, simple or forked, ending before the margin.
Sori: round, in one row near the margin, indusium: cup-like dissected into shallow lobes, hairy, basal, surrounding, sporangia: brownish.
Distribution: eastern Siberia, northeastern China, Korea, Manchuria, Japan.
Hardy to -30°C, USDA Zone 4.
This looks like just a younger W. polystichoides, but it is always a smaller plant with fewer pinnae pairs. Also, the upper pinnae are adnate to the rachis. Both species are distinguished by having the stipes jointed at the top. The old stipe bases of W. intermedia are 1-2 cm.
Woodsia subintermedia Tzvelev
Woodsia brantii Fr. & Sav.
Woodsia intermedia. Habit, early June.
Ray Edwards, © 2004.