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

6. Polystichum diffundens H. S. Kung & Li Bing Zhang, Acta Bot. Yunnan. 17: 27. 1995.

铺散耳蕨 pu san er jue

Plants evergreen. Rhizome erect, densely covered with lanceolate dark brown scales. Fronds spreading, ca. 40 cm; stipe stramineous, 11-15 cm, ca. 2 mm in diam. at base, scaly, shallowly canaliculate adaxially; scales dark brown, lanceolate and linear, lower part mixed with larger narrowly ovate dark brown scales. Lamina bipinnatifid, narrowly lanceolate, 25-31 × 5-6 cm at middle, not or slightly contracted at base, acuminate; rachis stramineous, without proliferous bulbils, densely scaly abaxially; scales blackish brown, linear with dilated base, margins ciliate. Pinnae 25-32 pairs, alternate, attached at right angles to rachis, shortly stalked, lanceolate, middle pairs ca. 3 × 1 cm, bases oblique, acroscopic margins truncate, basiscopic side cuneate, pinnatipartite except acroscopic bases with 1 or 2 free pinnules, apices acuminate. Lobes 9-12 pairs, alternate, ascendant, obliquely oblong, 2-5 × ca. 2 mm, serrulate, acute; abaxially sparsely scaly, adaxially glabrous; scales yellowish brown, filiform with dilated base; frond texture papery; venation pinnate on lobes, slightly concave on both surfaces. Sori in 1 row on each side of pinnule midrib; indusia present, repand-serrate.

● Forests, by streams; ca. 2100 m. W Sichuan (Jiulong).


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