1. Family: Aspleniaceae Newman
    1. Genus: Asplenium L.
      1. Asplenium lademannianum Rosenst.

        This species is accepted, and its native range is Rwanda to Burundi.

    [FTEA]

    Aspleniaceae, Henk Beentje. Flora of Tropical East Africa. 2008

    Type
    Type: Tanzania, “Kondoa-Irangi, Mt Ufiome”, Lademann s.n. (B/P?, holo. – not found) [Note Mt Ufiome = Mt Kwaraha, in T 2 Mbulu District)
    Rhizomes
    Description from Pichi Sermoilli and Chaerle: “rhizome erect, subwoody, 10–15 mm diameter, with flaccid membranous lanceolate entire acuminate rhizome scales ± 4 mm long, with a large hyaline lumen and dark brown narrow margins, ending in a hair-tip.
    Leaves
    Fronds to 58 × 16 cm.
    Stipes
    Stipe brown or grey-green, 17–22 cm long, with reflexed scales similar to rhizome scales mixed with linear ones, glabrescent.
    Leaf lamina
    Lamina lanceolate in outline, membranous-herbaceous, 2-pinnate, the basal pair remote and slightly reduced, apical pinna reduced, linear, incised-lobed.
    Pinnae
    Pinnae in ± 20 pairs, alternate or subopposite, shortly petiolulate, narrowly ovate, to 8 × 2.5 cm, pinnate, caudate-acuminate, the pinnules in up to 8 pairs, to 2 × 1 cm, deeply incised-lobed, glabrous except for the scaly costae and veins.
    Rachis
    Rachis brown, ± densely scaly with scales similar to stipe.
    Sori
    Sori 2–4 per pinnule, ‘short’.
    Indusium
    Indusium membranous, entire.”
    Ecology
    ‘in silva primaeva’, 1800 m
    Note
    Treated by Pichi Sermolli as full species; he saw part of the type – he also said most of the type was now missing at P (“the holotype was held in Rosenstock’s herbarium and now ought to be in Paris herbarium but... (...) in addition to this I have found a pencil rubbing of two fronds in B, two pinnae and some rhizome scales”). He says the rhizome is not erect but shortly creeping with shortly spaced fronds; this is based on Lambinon 74/1540, which “agrees very well with the type”. He adds that it resembles A. aethiopicum but is distinct in short-creeping horizontal rhizome, membranous and long-linear to narrowly linearlanceolate rhizome scales; that small forms of lademannianum look like A. lividum (but differ by rhizome scales and gradual shapes). Larger lademannianum look like A. volkensii but differ in frond dissection and short-creeping, not long-creeping; plus rhizome scale characters. Also treated by Chaerle in his unpublished thesis as a full species, keying out as rhizome creeping, 15 mm thick, 11–22 pinnae pairs, as opposed to rhizome erect/short-creeping, thinner, 6–12 pinnae pairs for A. aethiopicum. I am not convinced by all this. The part of the type with frond tracings at B could very well be A. aethiopicum; there is no indication at all whether the rhizome is erect or creeping. To equate specimens found far away I find very risky; I prefer to treat this taxon as unresolved.
    Distribution
    Range: Not known elsewhere Flora districts: T2 T5

    Distribution

    Native to:

    Burundi, Rwanda

    Asplenium lademannianum Rosenst. appears in other Kew resources:

    First published in Repert. Spec. Nov. Regni Veg. 6: 177 (1908)

    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
    • B.J.B.B. 55: 138 (1985).
    • F.R. 6: 177 (1908)

    Sources

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

    Kew Backbone Distributions
    The International Plant Names Index and World Checklist of Selected Plant Families 2019. 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 2019. 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