﻿Two new species in the fern genus Lomariopsis (Lomariopsidaceae) from East Asia.

Yi-Hsuan Wu,Germinal Rouhan,Chih-Yun Sun,Atsushi Ebihara,Li-Yaung Kuo,Ngan Thi Lu

doi:10.3897/phytokeys.187.77035

Abstract

Two East Asian Lomariopsis (Lomariopsidaceae, Polypodiales) species, Lomariopsismoorei and Lomariopsislongini, which were previously misidentified as L.spectabilis, are here described as new species based on evidence from morphological characters and a molecular phylogeny. The two species differ from the three other described species in East Asia by their venation, pinna shapes, and perine morphology. A phylogeny based on a combined dataset of three chloroplast regions (rbcL+ rps4-trnS + trnL-L-F) showed that L.moorei and L.longini each formed a well-supported monophyletic group which was distantly related to both L.spectabilis and the other morphologically similar East Asian species, L.boninensis.

Highlights

Lomariopsis Fée is the most species rich genus in the fern family Lomariopsidaceae and contains approximately 60 spp., accounting for 85% of the family (PPG I 2016)
One was from Chiayi County in Taiwan and Hainan Island in China, and the other one was from northern Vietnam and west southern China. They are superficially similar to two Asian species, L. boninensis Nakai and L. spectabilis in morphology
We presented a new Lomariopsis phylogeny supplied with comprehensive East Asian sampling, and reevaluated diagnostic characters leading to the description of these species

Summary

Introduction

Lomariopsis Fée is the most species rich genus in the fern family Lomariopsidaceae and contains approximately 60 spp., accounting for 85% of the family (PPG I 2016) This genus has a wide distribution in tropical and subtropical regions; there are 15 species in the Neotropics (Moran 2000), nine species in Africa (Roux 2009), species in the islands of the Indian Ocean (Holttum 1939b; Roux 2009; Rakotondrainibe and Jouy 2017), and species in Asia and the Oceanian region (Holttum 1932, 1939a, 1966, 1978). To investigate phylogenetically Lomariopsis from these poorly sampled areas, we sampled most Asian and Oceanian species, including all species in East Asia where two previously unidentified species were discovered. They both had been misidentified as L. spectabilis Mett. We presented a new Lomariopsis phylogeny supplied with comprehensive East Asian sampling, and reevaluated diagnostic characters leading to the description of these species

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