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

82. Polystichum yadongense Ching & S. K. Wu, Fl. Xizang. 1: 220. 1983.

亚东耳蕨 ya dong er jue

Plants summer-green. Rhizome unknown. Fronds ca. 50 cm; stipe stramineous, 10-17 cm, ca. 4 mm in diam. at base, scaly; scales light brown, ovate, lanceolate, and linear. Lamina bipinnatifid, oblanceolate, 38-40 × 6-7 cm, gradually contracted toward base, acuminate; rachis without proliferous bulbils, both surfaces densely covered with scales; scales light brown, lanceolate and linear. Pinnae 26-30 pairs, alternate, attached at right angles to rachis, nearly approximate, sessile, oblong-lanceolate, slightly curved upward and falcate, middle pinnae 3-3.5 × 1-1.4 cm, broadly cuneate, pinnatipartite to pinna rachis, acuminate and aristate. Lobes 5-7 pairs, alternate, slightly ascendant, nearly approximate, oblong, apex acuminate, aristate, margins coarsely toothed, tips of teeth aristate; abaxially scaly, adaxially with few linear light brown scales; microscales light brown, lanceolate and filiform; frond texture papery; venation pinnate on lobes, indistinct on both surfaces. Sori on upper pinnae, often in 1 row on each side of pinna rachis, sometimes 2-4 on basiscopic pinnae; indusia present, subentire.

● Riverbanks; ca. 3800 m. Xizang (Yatung).


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