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

18. Polystichum adungense Ching & Fraser-Jenkins ex H. S. Kung & Li Bing Zhang, Acta Phytotax. Sin. 32: 370. 1994.

阿当耳蕨 a dang er jue

Plants evergreen. Rhizome erect, densely covered with lanceolate brown scales. Fronds 12-14 cm; stipe stramineous, 4-5 cm, 1-2 mm in diam. at base, scaly; scales brown, filiform and lanceolate. Lamina 1-pinnate, linear-lanceolate, 10-14 × 2-3 cm, slightly contracted at base, acuminate; rachis without proliferous bulbils, scaly on both surfaces; scales filiform, strongly ciliate at base. Pinnae 10-12 pairs, alternate, attached at right angles to rachis, 1-2 cm apart from one another, ovate or rhombic-ovate, 1-1.6 × 0.8-1 cm, papery, bases obliquely cuneate or nearly truncate, acroscopic bases with semi-orbicular auricles, sometimes with 1 or 2 free pinnules, margins biserrate, tips of teeth spinulose, apices obtuse; both surfaces densely scaly; microscales filiform, strongly ciliate at base; frond texture leathery; venation pinnate on pinnae, slightly raised abaxially, slightly concave adaxially. Sori in 1 row on each side of midrib; indusia present, margins irregular.

Broad-leaved evergreen forests; ca. 1600 m. Yunnan (Gongshan) [NE India (Assam), N Myanmar].


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