Asplenium sandersonii Hook.

Species

Pteridophytes > Polypodiales > Aspleniaceae > Asplenium

Characteristics

Plants epilithic or epiphytic. Rhizome erect to suberect, to 15 mm long, to 2 mm in diameter, set with roots, crowded persistent stipe bases and scales, scales chartaceous, castaneous to ferrugineous, clathrate, sessile, lanceolate, cordate-imbricate, margins basally with a few scattered filiform outgrowths terminating in an enlarged obovate gland-like cell, entire towards the apex, apex terminates in an oblong thin-walled cell, to 5 mm long, to 1.2 mm wide. Fronds crowded, to 9 per plant, caespitose, arching, to 300 mm long; stipe firm, green, basally sulcate, centrally raised apically, to 80 mm long, to 1 mm in diameter, sparsely scaled, scales chartaceous, castaneous to ferrugineous, clathrate, sessile, lanceolate to subulate, cordate to cordate-imbricate, with scattered filiform outgrowths terminating in an enlarged obovate gland-like cell along the margin, apex terminates in an oblong thin-walled cell, to 3 mm long, to 0.3 mm wide; lamina anadromous, 1-pinnate, linear-cuneate, to 230 mm long, to 27 mm wide, with up to 24 pinna pairs, proliferous, bud borne at the apex of a rachis extension; rachis green, firm, sulcate, centrally ridged, sparsely scaled, scales similar to, but smaller than, those on the stipe; pinnae petiolate, petiole to 1.5 mm long, opposite to alternate, basally widely spaced, pinnae in the lower third of the lamina gradually reduced, coriaceous, rhombic-dimidiate to cuneate, lobed, in the larger pinnae the proximal acroscopic lobe shallowly 2-to 3-lobed, to 13 mm long, to 9 mm wide, glabrous adaxially and abaxially; costa adaxially slightly raised. Venation anadromous, adaxially obscure, evident abaxially, ending in the teeth near the margin. Sori linear, lunate, medial on the simple vein branches, to 3 mm long; indusium membranous, semicircular, lacerate, to 3 mm long, to 1.5 mm wide; sporangium long-stalked, uniseriate, 3-seriate below capsule, capsule broadly elliptic in lateral view, with (18-)19(-19) indurated annulus cells, epistomium 2-celled, hypostomium 4-celled. Spores 64 per sporangium, brown, elliptic, monolete, echinate, fenestrate, (38-)41.27(-44) x (26-)28.17(-30) µm.
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Rhizome erect, up to 5 mm long, up to 2 mm in diam., with brown or reddish brown, lanceolate scales up to 3.5 mm long. Fronds caespitose, arching, herbaceous to carnose-coriaceous. Stipe stramineous, green or brown, up to 70 mm long, glabrous or with brown, lanceolate, or hair-like scales up to 3 mm long. Lamina 1-pinnate, linear-lanceolate, up to 185 x 29 mm; basal pinnae slightly reduced or not, gradually reduced to apex. Rachis with narrow green wings and sparse hair-like scales, with a proliferous bud at end of rachis extension, up to 110 mm long. Pinnae short-petiolate, obcuneate, rectangular, or rhomboid, patent or curving and deflexed, dimidiate, up to 13 x 7 mm, shallowly to deeply lobed into 5-9 entire, rounded lobes on acroscopic and outer margins, subglabrous. Sori up to 2 mm long, oblong, up to 5 per pinna. Indusium membranous, oblong, erose.
Rhizome erect, c. 3 mm in diameter, set with brown, lanceolate-attenuate, entire rhizome-scales c. 4 mm long. Fronds tufted, thinly carnose-coriaceous, gemmiferous (bud borne at end of an extension of rhachis); stipe green when fresh, less than 'A lamina length, set with scattered scales with broadened fimbriate bases; lamina linear, c. 165 x 20 mm, pinnate, narrowly winging rhachis; pinnae in up to 32 pairs, rhombic-dimidiate to cuneate tending to lunate, basal pinnae reduced, outer margin shallowly lobed into usually 4-6 (up to 9) entire, obtuse lobes, upper surface glabrous, lower surface set with substellate scales. Sori oblong to semicircular, up to 5 per pinna, c. 2.5 mm long; indusium thinly membranous, lacerate, c. 1 mm broad.
Rhizome erect, ± 3 mm in diameter, set with brown rhizome scales. Fronds gemmiferous on rhachis. Proliferating bud borne at end of an extension of rhachis. Pinnae in up to 32 pairs, rhombic-dimidiate to cuneate tending to lunate, outer margin shallowly lobed into usually 4-6(-9) entire, obtuse lobes.
Life form -
Growth form herb
Growth support epiphyte
Foliage retention evergreen
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Root system rhizome
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Nitrogen fixer -
Photosynthetic pathway -

Environment

Light -
Soil humidity 4-6
Soil texture 7-8
Soil acidity -
Soil nutriment -
Hardiness (USDA) 9-12

Usage

Uses -
Edible -
Therapeutic use -
Human toxicity -
Animal toxicity -

Cultivation

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Distribution

Asplenium sandersonii world distribution map, present in Angola, Burundi, Cameroon, Congo, Comoros, Ethiopia, Gabon, Equatorial Guinea, Kenya, Madagascar, Mozambique, Mauritius, Malawi, Nigeria, Réunion, Rwanda, Sudan, Sao Tome and Principe, Tanzania, United Republic of, Uganda, South Africa, and Zimbabwe

Identifiers

LSID urn:lsid:ipni.org:names:17050860-1
WFO ID wfo-0001108035
COL ID HLDY
BDTFX ID -
INPN ID 705906
Wikipedia (EN)
Wikipedia (FR)

Synonyms

Asplenium sandersonii Asplenium punctatum Asplenium vagans Asplenium comorense Asplenium sandersonii var. sandersonii Asplenium melleri Asplenium sandersonii var. vagans