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      Rediscovering two Isoetes species in the Brazilian Amazon and Cerrado after 167 years

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          Abstract

          Abstract

          Isoetes amazonica and I. gardneriana were the first two species of the genus to be collected from Brazil. Isoetes amazonica was gathered by Richard Spruce in the Amazon basin near Santarém in the state of Pará in 1850. Isoetes gardneriana was collected by George Gardner in the current Dianópolis in Tocantins State in 1843. Despite being known for a long time by botanists, these species have not been recollected since then, which raised questions about their taxonomic recognition, current distribution ranges and conservation status. Fieldwork efforts led to the rediscovery of I. amazonica and I. gardneriana after 167 years. These collections enrich our understanding of their habitats and morphologies. We provide here re-descriptions for these species. Based on IUCN criteria, Isoetes amazonica and I. gardneriana should be assigned as data deficient (DD) and endangered (EN), respectively. The rediscovery of these species raises hopes that other areas in Amazon and Cerrado biomes harbour I. amazonica and I. gardneriana , respectively. This study will serve as a basis towards the conservation of these species.

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          Glossary of pollen and spore terminology

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            New Brazilian Floristic List Highlights Conservation Challenges

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              Diversity of ferns and lycophytes in Brazil

              Abstract This compilation of ferns and lycophytes in Brazil is an update of the one published in 2010 in Catálogo de Plantas e Fungos do Brasil. The methodology consisted in collecting data from regional checklists, taxonomic revisions, and selected databases. Invited specialists improved the list accessing a website housed at the Jardim Botânico do Rio de Janeiro. The results show 1,253 species: 1,111 of ferns and 142 of lycophytes. This number is 6.5% higher than the previous one (1,176 spp.). The percentage of endemic species decreased from 38.2% to 36.7%. We recognized 36 families and 133 genera (vs. 33 families, 121 genera in 2010). The 10 most diverse families are Pteridaceae (196 spp.), Dryopteridaceae (179), Polypodiaceae (164), Hymenophyllaceae (90), Thelypteridaceae (86), Aspleniaceae (78), Lycopodiaceae (64), Selaginellaceae (55), Anemiaceae (51), and Cyatheaceae (45). The three most diverse genera are still Elaphoglossum (87 spp.), Thelypteris (85), and Asplenium (74). The richest phytogeographic domain continues to be in the Atlantic Rainforest with 883 species which also has the largest number of endemic and threatened species, followed by the Amazon Rainforest (503), Cerrado (269), Pantanal (30), Caatinga (26), and Pampa (eight). Minas Gerais remains as the richest state (657 spp. vs. 580 in 2010).
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                Author and article information

                Contributors
                Journal
                PhytoKeys
                PhytoKeys
                3
                urn:lsid:arphahub.com:pub:F7FCE910-8E78-573F-9C77-7788555F8AAD
                PhytoKeys
                Pensoft Publishers
                1314-2011
                1314-2003
                2019
                05 December 2019
                : 135
                : 105-117
                Affiliations
                [1 ] Instituto Tecnológico Vale, Rua Boaventura da Silva, 955, 66055-090, Belém, PA, Brazil Instituto Tecnológico Vale Belém Brazil
                [2 ] Depto, Botânica da Universidade Estadual de Feira de Santana, Feira de Santana-BA, Brazil Universidade Estadual de Feira de Santana Feira de Santana Brazil
                [3 ] Universidade Federal de Mato Grosso do Sul, Campo Grande – MS, Brazil Universidade Federal de Mato Grosso do Sul Campo Grande Brazil
                Author notes
                Corresponding author: Jovani B. S. Pereira ( jovanibio@ 123456gmail.com )

                Academic editor: A. Troia

                Article
                46624
                10.3897/phytokeys.135.46624
                6908509
                Jovani B. S. Pereira, Ana Maria Giulietti, Vali J. Pott, Maurício T. C. Watanabe

                This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

                Categories
                Short Communication
                Isoetales
                Aquatic
                Conservation Biology
                Floristics & Distribution
                Americas
                South America

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