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FOC | Family List | FOC Vol. 2-3 | Dryopteridaceae | Polystichum

26. Polystichum orientalitibeticum Ching, Fl. Xizang. 1: 240. 1983.

藏东耳蕨 zang dong er jue

Plants evergreen. Rhizome erect, densely covered with broadly lanceolate dark brown scales. Fronds ca. 30 cm; stipe amber, 10-12 cm, ca. 2 mm in diam. at base, densely covered with linear reddish scales and narrowly ovate blackish purple scales. Lamina bipinnate, narrowly ovate, 22-30 × 7-8 cm, slightly rounded-cuneate, acuminate; rachis without proliferous bulbils, densely scaly on both surfaces; scales reddish brown, filiform and lanceolate, abaxially mixed with narrowly ovate blackish purple scales. Pinnae 18-22 pairs, alternate, attached at right angles to rachis, linear-lanceolate, middle pairs 3.5-4.5 × 1-1.2 cm, slightly oblique to rounded-cuneate, subsessile, pinnate, acuminate. Pinnules 7-10 pairs, lower pairs opposite, upper pairs alternate, slightly ascendant, approximate, obliquely ovate or rhombic, auricles deltoid, bases obliquely cuneate, margins with spinulose teeth, apices acuminate and spinulose; basal acroscopic pinnules largest, ca. 7 × 3 mm; abaxially scaly; microscales filiform, strongly ciliate at base; frond texture leathery; venation pinnate on pinnules, indistinct abaxially, slightly raised adaxially. Sori in 1 row on each side of midrib; indusia present, subentire.

● Broad-leaved forests; ca. 2000 m. E Xizang (Bomi).


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