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

206. Polystichum nayongense P. S. Wang & X. Y. Wang, Acta Bot. Yunnan. 19: 41. 1997.

纳雍耳蕨 na yong er jue

Plants evergreen. Rhizome erect, short, together with stipe base ca. 2 cm in diam. Fronds sparsely caespitose, 30-60 cm; stipe stramineous, 5-17 cm, 1-2 mm in diam., basal stipe scales denser, slightly spreading, brown, broadly ovate, thickly membranous, with irregular fine teeth or subentire, caudate; distal stipe scales sparser, similar to basal stipe scales but smaller, mostly appressed, brown, membranous. Lamina 1-pinnate, grayish when dry, adaxially darker, lanceolate or narrowly elliptic-lanceolate, 20-44 × 3-5 cm at middle, 2-4 cm wide at base, base truncate and slightly contracted or not, apex caudate and long acuminate; rachis stramineous, without proliferous bulbils. Pinnae 25-38 pairs, alternate or nearly opposite, lower pairs remote, attached at right angles with rachis, basal pinnae rarely slightly angled basiscopically, upper pairs contiguous or slightly imbricate, slightly angled acroscopically, falcate or oblong-falcate, 1-2.5 cm × 4-8 mm at middle, apices slightly angled upward, with aristate tip, bases obviously asymmetrical, acroscopic base auriculate, auricles deltoid or nearly semicircular, apex of auricles acute and aristate, proximal margins of auricles truncate or slightly curved, parallel to rachis or slightly overlapping rachis, acroscopic margins substraight or slightly recurved, with regular, acute, curved upward, aristate teeth, basal basiscopic margins narrowly cuneate, truncate, margins entire, distal basiscopic margins curved upward from middle upward, with regular, acute, often incurved, and aristate teeth; adaxially glabrous, abaxially sparsely scaly; microscales appressed, light brown, ovate, thinly membranous; frond texture papery or thickly papery. Sori terminal on shorter veinlets, in 1 row on each side of midrib, nearly medial, often 5-9 above midrib, 1-4 below midrib and on upper part only; indusia present, light brown, entire or slightly repand, evanescent.

● Limestone sinkholes; ca. 1500 m. W Guizhou (Nayong).


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