1. Family: Aspleniaceae Newman
    1. Genus: Hymenasplenium Hayata
      1. Hymenasplenium unilaterale (Lam.) Hayata

        This species is accepted, and its native range is Tropical & S. Africa, W. Indian Ocean.

    [FTEA]

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

    Type
    Type: Mauritius, no locality, Commerson s.n. (P!, holo.)
    Habit
    Usually on rocks but occasionally terrestrial or low epiphyte
    Rhizomes
    Rhizome longcreeping, 2–3 mm diameter, with dark brown clathrate lanceolate entire rhizome scales up to 2 mm long.
    Leaves
    Fronds spaced, erect.
    Stipes
    Stipe shiny dark brown to blackish, 7.5–22 cm long, glabrous.
    Leaf lamina
    Lamina 17–30 × 5–10 cm, 1-pinnate, narrowly oblong in outline with lowest pinnae hardly reduced but often more lobed, apex decrescent end attenuate.
    Pinnae
    Pinnae in 12–20 pairs, herbaceous, like a curved paralellogram or narrowly triangular, up to 3.5–6 × 0.5–1.2 cm, dimidiate for about 1/2 of their length, petiolate, basiscopic base absent (= costa), acroscopic base parallel to rachis, serrate to doubleserrate to dentate on the acroscopic margin, often doubly serrate towards the apex, basiscopic margin entire and formed by the costa for half or 2/3, the upper half or 1/3 double serrate or even slightly lobed; glabrous on both surfaces.
    Rachis
    Rachis shiny dark brown, glabrous. Sori 2–10(–14), confined to the outer 1/4 to 1/2 of the pinna, oblong to very narrowly oblong, set at an angle of about 30° to the costa, 2.5–3 mm long; indusium narrowly oblong, membranous, entire, 0.8 mm wide.
    Figures
    Fig. 4: 8–9, p. 25.
    Ecology
    In moist or riverine forest, always near streams or waterfalls where it may be locally common; 450–1950 m
    Conservation
    Widespread; least concern (LC)
    Note
    Luke & Luke 5115 from T 7, Udzungwa Mts, has the sori spread over more of the pinna then usual.
    Distribution
    Range: Tropical Africa, Malawi, Zimbabwe, Mascarene Is., S and E Asia and the Pacific Is. Flora districts: U2 U3 U4 K4 K5 K7 T2 T3 T6 T7

    Distribution

    Native to:

    Angola, Cameroon, Central African Repu, Comoros, Ethiopia, Ghana, Guinea, Gulf of Guinea Is., Ivory Coast, Kenya, Liberia, Madagascar, Malawi, Mauritius, Niger, Nigeria, Northern Provinces, Réunion, Seychelles, Sierra Leone, Sudan, Tanzania, Uganda, Zimbabwe

    Hymenasplenium unilaterale (Lam.) Hayata appears in other Kew resources:

    First published in Bot. Mag. (Tokyo) 41: 712 (1927)

    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.

    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