Dryopteris ruwenzoriensis C.Chr. ex Fraser-Jenk.

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Synonyms:
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Description:
Rhizome short, decumbent to suberect, to 15 mm in diameter, set with roots, crowded persistent stipe bases, and scales; rhizome scales dull, chestnut to rust coloured, papery, broadly attached, narrowly ovate to lanceolate, to 12 x 4 mm, broadly cuneate, margin wavy to irregular. Fronds tufted, erect to arching, to 1.35 m long. Stipe chestnut coloured at the base, straw coloured higher up, to 72 cm long, variously set with hairs and minute, membranous scales. Lamina firmly herbaceous, ovate to triangular in outline, to 64 x 54 cm, 2-pinnate-pinnatifid to 3-pinnate, with up to 5 pinna pairs. Pinnae petiolate, the petiole to 6 mm long, near opposite to alternate, more widely spaced near the base, slightly imbricate or not, the basal pair conspicuously basiscopically developed, inaequilaterally narrowly ovate to triangular in outline, 1-pinnate-pinnatifid to 2-pinnate, the basal pair the longest, to 31 x 12.5 cm wide, with up to 2 pinnule pair. Pinnules petiolate, the petiole to 2 mm long, sessile and progressively more broadly attached and basiscopically decurrent towards the apex, lanceolate to oblong-acuminate, pinnatifid to deeply lobed, the acroscopic pinnule on the basal pinna to 5.1 x 2 cm, the basiscopic pinnule on the basal pinna to 8.8 x 2.6 cm, near opposite to alternate, spaced to slightly imbricate. Ultimate segments closely spaced but not imbricate, oblong-obtuse to oblong-truncate, to 1.6 x 0.9 cm, shallowly and inconspicuously lobed; lobes with conspicuously and acutely toothed apices, upper surface hairless or with a few hairs and hair-like scales along the costules, lower surface variously set with scales and minute hairs along the veins. Venation pinnately branched in the segments, the vein branches pinnately branched, forked, or simple near the apex, evident, ending in the teeth near the margin. Rhachis, pinnae rhachis straw coloured, upper surface shallowly grooved, becoming narrowly winged near the apex, initially variously set with hairs and minute scales. Costae upper surface shallowly grooved, pronounced lower surface, narrowly winged along the entire length, variously scaled. Sori circular, to 1.5 mm in diameter at maturity, medial to inframedial, predominantly on the vein branches, discrete, essentially in 2 rows on the segments; exindusiate.
Notes:
Derivation of specific name: ruwenzoriensis: refering to the Ruwenzori Mountains on the border between the DRC and Uganda, the type locality of this species.
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Other sources of information about Dryopteris ruwenzoriensis:

External websites:

African Plants: A Photo Guide (Senckenberg): Dryopteris ruwenzoriensis
BHL (Biodiversity Heritage Library): Dryopteris ruwenzoriensis
EOL (Encyclopedia of Life): Dryopteris ruwenzoriensis
GBIF (Global Biodiversity Information Facility): Dryopteris ruwenzoriensis
Google: Web - Images - Scholar
iNaturalist: Dryopteris ruwenzoriensis
IPNI (International Plant Names Index): Dryopteris ruwenzoriensis
JSTOR Plant Science: Dryopteris ruwenzoriensis
Mansfeld World Database of Agricultural and Horticultural Crops: Dryopteris ruwenzoriensis
Plants of the World Online: Dryopteris ruwenzoriensis
Tropicos: Dryopteris ruwenzoriensis
Wikipedia: Dryopteris ruwenzoriensis




Flora of Rwanda: Species information: Dryopteris ruwenzoriensis.
https://www.rwandaflora.com/speciesdata/species.php?species_id=236320, retrieved 3 December 2024

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