长白山阴地蕨 chang bai shan yin di jue

Osmunda lanceolata S. G. Gmelin, Novi Comment. Acad. Sci. Imp. Petrop. 12: 516. 1768; Botrychium manshuricum Ching; B. ramosum Wang Wei et al. (1958), not (Roth) Ascherson (1864); B. ramosum var. manshuricum (Ching) Kitagawa.

Rhizomes shortly cylindrical, annually producing 1 frond 5-20 cm tall. Common stipe green, 4-15 cm. Sterile lamina subternate, 2-pinnatifid, medium green to yellow-green, somewhat shiny, broadly ovate-deltoid, 1-4 × 1-3 cm; pinnae lanceolate, up to 1 cm wide, deeply pinnatifid, apex acute; upper pinnae and segments of basal pinnae oblong, up to 2 cm wide; veins pinnate, free. Sporophore arising at top of common stipe, narrowly deltoid, 1-6 cm, 2-pinnate; sporangia exposed and not immersed, mostly approximate or slightly separated and covering midrib of pinnae. Spore surface tuberculate to irregularly verrucose. 2n = 90.

Rocky places; high elevations. Jilin (Changbai Shan), Nei Mongol [Japan; Asia, Europe, North America].