-brown, subulate, firm; frond distant, dimorphous,steriLe one narrowly linear elongate, stipe to 10 cm long, slender, pale straminous, lamina 10-15 cm long, 2-3 cm broad,slightly broader towards base, bipinnate; pinna l0-15-jugate, thombic, petiolate, basal pair to 3. 5 cm long, upper ones 2 cmlong, subunequally cuneate at base, pin.nutes 2-3-jugate, subrhombic, base slightly decurrent, apex obtuse; segments 2-3-jugate, small, 2-3-dentate; texture rather rigid, color green; fertile frond much longer and broader, stipe 15-20 cm long,straminous, lamina as long as stipe, broadly lanceolate, long-attenuate towards above middle, base to 6 cm broad,tripinnate; pinnae l0-15-jugate, long-petiolate, base unequally cuneate, basal pair to 10 cm long, 3 cm broad, long-acuminate towards simple pinnate apex; segments few, sili-queform, 10 mm long, 1. 5 mm broad, acuminate; sori linear, 5-7 mm long, indusium conforms, broad, gray, entire, reaching costule from both sides.
Sichuan: Moupin, David (type).
This species, confined to the highland of western Sichuan, differs from O. japonicum Kze. in much narrower and lessdivided frond and particularly the sterile one, which is of linear-elongate outline to 3 cm broad from somewhat broader base,and the fertile frond with extremely l
ng-attenuate upper part.
Plate 162. Fig. 1. Habit sketch (natural size). 2. Portion of sterile frond, showing venation (X 8), 3. Portion offertile frond (x 8). 4. Ultimate segment of fertile frond, showing position of sori and indusia (X 16). 5. Scale fromthizome ( X 27).
以下为对购买帮助不大的评价