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

41. Polystichum altum Ching ex Li Bing Zhang & H. S. Kung, Acta Phytotax. Sin. 36: 465. 1998.

高大耳蕨 gao da er jue

Plants evergreen. Rhizome erect or ascending, short, densely covered with linear grayish brown scales. Fronds up to 1 m; stipe stramineous, 22-44 cm, 5-7 mm in diam. at base, densely covered with linear and lanceolate grayish brown scales and larger scales; large scales dense, grayish brown, ovate-lanceolate and broadly lanceolate, up to 14 × 4 mm, subentire or with few small teeth, long acuminate. Lamina bipinnate, oblong-lanceolate, 38-66 × 20-36 cm at middle, not or slightly contracted toward base, acute; rachis without proliferous bulbils, covered with linear and lanceolate grayish brown scales and larger scales; large scales dense, ovate-lanceolate and narrowly lanceolate, up to 10 × 2.2 mm, subentire or with few small teeth, caudate. Pinnae 14-18 pairs, opposite or nearly opposite, ascendant, shortly stalked, lanceolate, not contracted toward base, bases asymmetrical or ± asymmetrical, apices caudate, middle pinnae 12-20 × 2.5-3.4 cm, 1-pinnate; costa scaly; scales ovate-lanceolate, lanceolate, and linear. Pinnules 15-21 pairs, alternate, shortly stalked, narrowly falcate-oblong, 1.4-2.3 × 0.6-0.8 cm, bases cuneate, apices acute, acroscopic margins shallowly toothed, teeth shortly aristate at tip, pinnules with deltoid auricles, basiscopic margins entire, shortly aristate, basal pair largest, incised; abaxially densely covered with lanceolate microscales, adaxially glabrous; frond texture thinly leathery; venation pinnate on pinnules, lateral veins 6-9 pairs, dichotomous, distinct. Sori (4-)8-10 pairs per pinnule, in 1 row on each sideof midrib or more on acroscopic margin, nearly terminal on veinlets, large, grayish brown; indusia not well developed, indistinct.

● Forests; 1100-1800 m. Sichuan, Yunnan (Suijiang).


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