Polystichum transvaalense N.C.Anthony

Species

Pteridophytes > Polypodiales > Dryopteridaceae > Dryopteridoideae > Polystichum

Characteristics

Plants terrestrial or epilithic. Rhizome short, erect, to 8 mm in diameter, densely set with roots, persistent stipe bases, and paleae; paleae broadly attached, castaneous, chartaceous, narrowly linear to narrowly lanceolate, the margins proximally entire, distally with numerous short, apically or basally directed outgrowths, the apex terminating in an acicular cell, to 14 x 1 mm. Fronds caespitose, 5-17 per plant, suberect to arching, to 1.045 m long: stipe proximally castaneous, stramineous distally, adaxially sulcate, to 535 mm long x 5 mm in diameter, densely paleated, the paleae twisted; larger paleae mostly confined to the stipe, concolorous or bicolorous, castaneous to ferrugineous or with the central part castaneous to black, rugose, narrowly ovate-acuminate to ovate-acuminate, short-stalked, the margins irregularly lacerate-fimbriate, the apex terminating in an acicular cell, to 20 x 6 mm; smaller paleae short-stalked, narrowly ovate to narrowly lanceolate, the margins proximally lacerate, distally irregularly lacerate-fimbriate, the apex terminating in an acicular cell, to 6.5 x 1.4 mm: lamina 2-pinnate, with up to 26 free pinna pairs, herbaceous, ovate to narrowly ovate, to 670 mm long, pale green adaxially, paler abaxially, the proximal pinnae often slightly reduced, often deflexed: rachis stramineous, adaxially sulcate, often flexuous distally, densely paleated; paleae short-stalked, twisted, castaneous to ferrugineous, narrowly ovate, narrowly triangular, or linear, the margins proximally lacerate, distally irregularly and widely fimbriate, the apex terminating in an acicular cell, to 4.5 mm long: pinnae 1-pinnate, with up to 20 free pinnule pairs, proximally widely spaced, distally closely spaced and somewhat overlapping, oblong-attenuate, the basal pinnae to 140 mm long x 28 mm wide, proximally often slightly reduced, the basalmost acroscopic pinnules longer towards the middle of the lamina: pinna-rachis stramineous, adaxially sulcate, densely paleated; paleae similar to but smaller than those on the rachis: pinnules opposite to alternate, inaequilateral, acroscopically auriculate, ovate to obliquely transversely rhomboid, to 15 mm long, serrate to lobate-serrate, often short-aristate, the proximal pinnules often pinnatifid; adaxially subglabrous or with a few twisted, filiform paleae proximally on costa, the apex terminating in an acicular cell, to 2 mm long; abaxially moderately paleated; paleae short-stalked, twisted, narrowly linear to narrowly triangular, the margins proximally long-lacerate or fimbriate, the apex terminating in an acicular cell, to 2.5 mm long. Venation immersed. Sori circular, c. 1 mm in diameter, terminal or near terminal on abbreviated vein branches, discrete at maturity: sporangium with 10-(14)-22 indurated annulus cells; stalk eglandular: indusium stramineous, peltate, circular, simple or often with a few long central processes, repand to erase, persistent, the maximum radius 0.48-(0.76)-0.97 mm. Spores 64 per sporangium, brown, the perispore folded to form tubercles and inflated or compressed reticulate ridges, echinulate, closely perforated, the pores to 1.5 µm in diameter, the exospore 30-(38.54)-48 x 22-(28.86)-38 µm.
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Rhizome erect, c. 7 mm in diameter, set with somewhat ferrugineous, linear-attenuate, irregularly fimbriate-dentate rhizome-scales c. 12 x 1 mm. Fronds arching, forming a shuttlecock-shaped plant; stipe shorter than lamina, lower half set with ovate-attenuate, minutely lacerate-fimbriate, brown to castaneous, often centrally darkened and thickened scales c. 15 mm long; lamina herbaceous, narrowly ovate-attenuate, up to 650 x 300 mm, mostly 2-pinnate, truncate basally; pinnae falcate attenuate; pinnules about twice as long as broad, auriculate, usually overlapping, aristae 0.5 mm long, first basiscopic arista of each pinnule folded over upper surface, upper surface subglabrous, lower surface set with very narrowly linear twisted pale scales c. 1 mm long; venation apparent; rhachis and secondary rhachises set with narrow, very lacerate-fimbriate-based, ferrugineous, matted and appressed scales. Indusium fimbriate-erose, pale brown to ferrugineous, c. 1 mm in diameter.
Rhizome short, erect, with crowded stipe bases and castaneous, narrowly linear to narrowly lanceolate scales with short outgrowths. Fronds caespitose, suberect to arching, up to 1.05 m long. Stipe proximally castaneous, densely set with larger and smaller scales, larger scales castaneous to ferruginous or with the central part castaneous to black, narrowly ovate-acuminate to ovate-acuminate scales, irregularly lacerate-fimbriate. Lamina ovate to narrowly ovate, 2-pinnate. Pinnae oblong-attenuate, 1-pinnate. Pinnules ovate to obliquely transversely rhomboid, acroscopically auriculate, proximal pinnules often pinnatifid, serrate to lobate-serrate, often shortly aristate, adaxially subglabrous, abaxially moderately scaled. Sori round, up to 1 mm in diam. Indusium round, rarely incomplete, repand to erose.
Terrestrial or epilithic. Rhizome erect, rarely procumbent, with brown scales. Fronds tufted, erect to arching, 2-pinnate, basal pinnae not or only slightly reduced, lamina narrowly ovate, attenuate, 300-650 x 160-300 mm, subglabrous adaxially, with sparse hair-like scales abaxially; pinnules elliptic to obovate, auriculate, margins aristate, basal basiscopic arista folded over adaxial surface; rachis with brown, hair-like scales; stipe pale brown, with few, both fine, hair-like and large scales, denser basally. Sporangia in circular sori with peltate, erose indusium, ± 1 mm in diameter.
Perennial with short, suberect rhizome. Fronds suberect, to 1 m long, caespitose, stipe scaled, lamina 2-pinnate, narrowly ovate-attenuate, pinnules auriculate, aristate, subglabrous above, with twisted scales beneath. Sori circular, indusium peltate, fimbriate.
Rhizome erect. Lamina 2-pinnate. Rhachis scales ferrugineous. Basal basiscopic arista of each pinnule folded over upper surface of lamina. Fronds ovate-truncate, herbaceous, ariste ±0,5 mm long.
Life form perennial
Growth form herb
Growth support -
Foliage retention evergreen
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Root system rhizome
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Environment

Light -
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Soil texture 5-8
Soil acidity -
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Hardiness (USDA) 9-12

Usage

Uses -
Edible -
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Cultivation

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Distribution

Polystichum transvaalense world distribution map, present in Cameroon, Eritrea, Ethiopia, Equatorial Guinea, Kenya, Lesotho, Mozambique, Malawi, Rwanda, South Sudan, Tanzania, United Republic of, Uganda, South Africa, Zambia, and Zimbabwe

Conservation status

Polystichum transvaalense threat status: Least Concern

Identifiers

LSID urn:lsid:ipni.org:names:17503920-1
WFO ID wfo-0001110880
COL ID 4LNBW
BDTFX ID -
INPN ID -
Wikipedia (EN)
Wikipedia (FR)

Synonyms

Polystichum transvaalense