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

15. Polystichum delavayi (Christ) Ching ex Li Bing Zhang & H. S. Kung, Acta Phytotax. Sin. 36: 468. 1998.

洱源耳蕨 er yuan er jue

Polystichum ilicifolium (D. Don) T. Moore var. delavayi Christ, Bull. Soc. Bot. France 52(Mém. 1): 31. 1905; P. stimulans (Kunze ex Mettenius) Beddome var. delavayi (Christ) H. S. Kung.

Plants evergreen. Rhizome erect, densely covered with lanceolate brown scales. Fronds 20-30 cm; stipe stramineous, 6-10 cm, ca. 2 mm in diam. at base, densely scaly; scales light brown, lanceolate and ovate. Lamina linear-lanceolate, 15-18 × 1.8-2.5 cm, not contracted at base, 1-pinnate but basal pinnae sometimes pinnatifid, acuminate or long acuminate; rachis without proliferous bulbils, densely scaly abaxially; scales light brown, lanceolate and linear, margins ciliate. Pinnae 24-35 pairs, alternate, slightly ascendant, rhombic-ovate, 8-12 × 5-8 mm, bases obliquely broadly cuneate, auricles deltoid, margins with small teeth, basal acroscopic margins of lower pinnae 1-lobed, apices acute and mucronate; abaxially scaly; microscales filiform; frond texture leathery; venation pinnate on pinnae, slightly raised abaxially, slightly concave abaxially. Sori in 1 row on each side of midrib; indusia present, concave at center, toothed.

● Broad-leaved forests, limestone cliffs; 2200-2300 m. NW Yunnan (Eryuan, Zhongdian).

Fraser-Jenkins (Himalayan Ferns (Guide to Polystichum), 28. 1997) treated Polystichum delavayi as a synonym of P. cyclolobum.


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