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

20. Polystichum mehrae Fraser-Jenkins & Khullar, Indian Fern J. 2(1, 2): 10. 1985.

印西耳蕨 yin xi er jue

Polystichum acanthophyllum (Franchet) Christ var. indicum Christ; P. mehrae f. latifundus H. S. Kung & Li Bing Zhang.

Plants evergreen. Rhizome erect, densely covered with lanceolate brown scales. Fronds 12-30 cm; stipe stramineous, 2-14 cm, 1-4 mm in diam. at base, scaly; scales brown, ovate and narrowly lanceolate. Lamina bipinnatifid or bipinnate, narrowly lanceolate, 10-26 × 2.5-5 cm, slightly contracted at base, acuminate; rachis without proliferous bulbils, abaxially scaly; scales brown, larger scales lanceolate, margins ciliate; smaller scales filiform, strongly ciliate at base. Pinnae 14-25 pairs, alternate, attached at right angles to rachis or slightly ascendant, ovate to narrowly ovate, 1.2-3 × 0.8-1.5 cm, obliquely cuneate to broadly cuneate, shortly stalked, pinnatifid or pinnate, acuminate. Lobes or pinnules 1-4 pairs, alternate, attached at right angles to rachis, broadly ovate or ovate, basal acroscopic lobes often free and largest, margins entire or sometimes serrulate, apices acuminate and spinulose; abaxially scaly; microscales filiform, strongly ciliate at base; frond texture leathery; venation pinnate on lobes or pinnules, slightly raised abaxially, indistinct adaxially. Sori in 1 row on each side of midrib; indusia present, slightly incised.

Forests, limestone rocks, basic soils; 2300-2500 m. W Sichuan (Daocheng, Kangding, Tianquan), E Xizang, Yunnan [Bhutan, N India, Kashmir, Nepal, Pakistan].


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