Polystichum zayuense W.M.Chu & Z.R.He

Species

Pteridophytes > Polypodiales > Dryopteridaceae > Dryopteridoideae > Polystichum

Characteristics

Plants summer-green. Rhizome erect, short, together with remnant stipe base up to 1 cm in diam., rhizome apex and stipe base densely scaly; scales brown, lanceolate, up to 5 mm, membranous, with few long teeth. Fronds ca. 25 cm; stipe grass-green, 6-7 cm, less than 1 mm in diam., distal stipe scales sparse, brown, narrowly lanceolate or linear, 1-2 mm, sparsely toothed. Lamina 1-pinnate, grass-green on both surfaces, adaxially darker, oblong-linear-lanceolate, up to 18 × 2-2.5 cm, apex pinnatifid and acuminate; rachis without proliferous bulbils, abaxially sparsely scaly, adaxially broadly and deeply sulcate; scales brown, clavate. Pinnae more than 25 pairs, obliquely oblong, 0.5-1.5 cm × 3-7 mm, pinnatifid to pinnatipartite, acute or obtuse, basal acroscopic margins pinnatipartite nearly to midrib and forming a pinnatilobate obovate auriculate lobe, other lobes rectangular and bilobed apically, or shortly falcate and entire on margin, primary and secondary lobes acute; abaxially sparsely covered with clavate brown microscales; frond texture thinly papery; venation pinnate on pinnae, visible abaxially, indistinct adaxially, with only 1 veinlet per primary lobe or secondary lobe. Sori terminal or abaxial on veinlets, often only 1 per lobe, sometimes 2 on basal auriculate lobes; indusia present, large, as wide as lobes, thinly membranous, dark brown when mature, centers slightly concave, coarsely lobed. Spores semicircular in equatorial view.
Life form perennial
Growth form herb
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Foliage retention evergreen
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Root system rhizome
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Environment

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Usage

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Cultivation

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Distribution

Polystichum zayuense world distribution map, present in China and Nepal

Identifiers

LSID urn:lsid:ipni.org:names:77127252-1
WFO ID wfo-0001260179
COL ID 7877K
BDTFX ID -
INPN ID -
Wikipedia (EN)
Wikipedia (FR)

Synonyms

Polystichum zayuense Polystichum thomsonii f. himalaicum