Abrodictyum inexpectatum, an unexpected new fern species (Hymenophyllaceae, Polypodiidae) for Madagascar, as revealed by an integrative approach

JEAN-YVES DUBUISSON; LUCIE BAURET; ELODIE BOUCHERON-DUBUISSON; GERMINAL ROUHAN

doi:10.11646/phytotaxa.568.1.6

Issue: Vol. 568 No. 1: 11 October 2022

Type: Article

Published: 2022-10-11

DOI: 10.11646/phytotaxa.568.1.6

Page range: 83-91

Abstract views: 39

PDF downloaded: 1

Abrodictyum inexpectatum, an unexpected new fern species (Hymenophyllaceae, Polypodiidae) for Madagascar, as revealed by an integrative approach

JEAN-YVES DUBUISSON⁺⁻
LUCIE BAURET⁺⁻
ELODIE BOUCHERON-DUBUISSON⁺⁻
GERMINAL ROUHAN⁺⁻

Institut de Systématique, Evolution, Biodiversité (ISYEB), Sorbonne Université, MNHN, CNRS, EPHE, Université des Antilles, CP 48, 57 rue Cuvier, 75005 Paris, France

Institut de Systématique, Evolution, Biodiversité (ISYEB), Sorbonne Université, MNHN, CNRS, EPHE, Université des Antilles, CP 48, 57 rue Cuvier, 75005 Paris, France; Institut de Systématique, Evolution, Biodiversité (ISYEB), Muséum national d’Histoire naturelle, CNRS, SU, EPHE, Université des Antilles, CP 39, 57 rue Cuvier, 75005 Paris, France

Institut de Systématique, Evolution, Biodiversité (ISYEB), Sorbonne Université, MNHN, CNRS, EPHE, Université des Antilles, CP 48, 57 rue Cuvier, 75005 Paris, France

Institut de Systématique, Evolution, Biodiversité (ISYEB), Muséum national d’Histoire naturelle, CNRS, SU, EPHE, Université des Antilles, CP 39, 57 rue Cuvier, 75005 Paris, France

Andapa Antsiranana filmy ferns Western Indian Ocean Pteridophytes

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Abstract

The fern genus Abrodictyum (Hymenophyllaceae) is thought to have at least seven species in the Afro-Malagasy region. But morphological re-examination of uncommon specimens, comparison with supposedly related taxa, and a new molecular phylogenetic analysis clearly led to recognize an additional species for Madagascar. We here describe this new species as Abrodictyum inexpectatum sp. nov. Morphologically, the new species differs from the closely related and sympatric A. franceae by its smaller size, narrower ultimate segments and the plane fronds in the wild, vs. crispate for A. franceae. We provide a modified key to all eight species of Abrodictyum now recognized in the Afro-Malagasy region.

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