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  1. Family: Polypodiaceae J.Presl & C.Presl
    1. Genus: Polystichum Roth
      1. Polystichum volkensii (Hieron.) C.Chr.

        This species is accepted, and its native range is Kenya to Tanzania.

    [FTEA]

    Dryopteridaceae, JP Roux, M Shaffer-Fehre, B Verdcourt. Flora of Tropical East Africa. 2007

    Type
    Tanzania, above Kiboscho, Volkens 1520 (B!, holo.)
    Habit
    Terrestrial.
    Rhizomes
    Rhizome short, erect, up to 1 cm in diameter, with persistent dense papery reddish narrowly lanceolate scales up to 15 mm long
    Leaves
    Fronds tufted, up to 8 per plant, erect, up to 120 cm long.
    Stipes
    Stipe reddish-brown at base, straw-coloured above, up to 10–52 cm long, to 1 cm in diameter, with adaxial groove, stipe bases persistent, with dense reddish translucent shortly stalked scales, the larger elliptic to ovate, up to 34 × 10 mm, the smaller convolute, ovate.
    Leaf lamina
    Lamina herbaceous, adaxially olive green, abaxially pale green, narrowly ovate, up to 93 cm long, 3-pinnate.
    Rachis
    Rachis straw-coloured with adaxial groove, with dense often folded scales up to 18 × 6 mm, smaller than, but resembling those of, the stipe, and with a single gemmiferous bud, covered in scales, near apex.
    Pinnae
    Pinnae oblong-attenuate, slightly falcate, basal pinnae up to 54 mm long , middle pinnae to 190 × 40 mm, lowest acroscopic pinnule slightly enlarged, a single pair of basal pinnae decrescent, often somewhat deflexed; costa straw-coloured with adaxial groove, scales dense, similar to but smaller than those on rachis; pinnules asymmetric, wedge-shaped, ovate, up to 23 × 11 mm, acroscopic margin auriculate, deeply lobed, lobes oblong, serrate to crenate, adaxially with few folded, filiform scales up to 15 mm long, abaxially covered with red to reddish-brown papery folded filiform scales up to 16.5 mm long
    Sori
    Sori medial on unabbreviated vein branches, mostly uniseriate, discrete at maturity, in excess of 1 mm in diameter; sporangia with 12–19 indurated annulus cells; indusium reddish to reddish-brown, peltate, circular, elliptic or amorphous in outline
    Spores
    Spores with reticulum of compressed ridges enclosing granulate, verruculate to echinulate surfaces.
    Figures
    Figure 10: 7–8, figure 11:7
    Ecology
    Upper moist forest zone, Hagenia zone, giant heath zone; 2800–3600 m
    Conservation
    Restricted distribution; although rare, it does not appear to be threatened.
    Distribution
    Flora districts: K3 K4 T2 Range: Endemic to Aberdares/Nyandarua and Kilimanjaro

    Images

    Distribution

    Native to:

    Kenya, Tanzania

    Synonyms

    Other Data

    Polystichum volkensii (Hieron.) C.Chr. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Jan 1, 1966 Fries, R.E. [2735], Kenya K000351190

    Bibliography

    First published in Index Filic.: 97 (1905)

    Accepted by

    • Roskov Y. & al. (eds.) (2018). World Ferns: Checklist of Ferns and Lycophytes of the World Species 2000 & ITIS Catalogue of Life Naturalis, Leiden, the Netherlands.

    Literature

    Flora of Tropical East Africa

    • Roux, Polystichum in Africa: 188, t. 64–66 (1998).
    • U.K.W.F. ed. 2: 35 (1994)
    • Index filic.: 589 (1906)

    Sources

    Flora of Tropical East Africa
    Flora of Tropical East Africa
    http://creativecommons.org/licenses/by-nc-sa/3.0

    Herbarium Catalogue Specimens
    'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
    Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

    Kew Backbone Distributions
    The International Plant Names Index and World Checklist of Selected Plant Families 2020. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

    Kew Names and Taxonomic Backbone
    The International Plant Names Index and World Checklist of Selected Plant Families 2020. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0