Lectotypification and observations on the morphology, distribution and conservation status of Isoetes luetzelburgii (Isoetaceae)

JOVANI BERNARDINO DE SOUZA PEREIRA; LEANDRO C. SILVESTRE; AUGUSTO C.P. SANTIAGO

doi:10.11646/phytotaxa.364.3.9

Issue: Vol. 364 No. 3: 14 August 2018

Type: Article

Published: 2018-08-14

DOI: 10.11646/phytotaxa.364.3.9

Page range: 289–295

Abstract views: 46

PDF downloaded: 1

**Lectotypification and observations on the morphology, distribution and conservation status of Isoetes luetzelburgii (Isoetaceae)**

JOVANI BERNARDINO DE SOUZA PEREIRA⁺⁻
LEANDRO C. SILVESTRE⁺⁻
AUGUSTO C.P. SANTIAGO⁺⁻

Instituto Tecnológico Vale, Desenvolvimento Sustentável, 66055-090, Belém, Pará, Brazil

Universidade Federal do Rio Grande do Norte, Departamento de Botânica, Ecologia e Zoologia, 59072-970, Natal, Rio Grande do Norte, Brazil

Universidade Federal de Pernambuco, Núcleo de Biologia, 55608-680, Vitória de Santo Antão, Pernambuco, Brazil

Pteridophytes Caatinga endangered species northeastern Brazil spores taxonomy

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Abstract

Isoetes is a worldwide aquatic plant group with ca. 250 species. In South America, Isoetes luetzelburgii is one of the few species that inhabits semi-arid areas. This is an endangered species known from only few collections, which causes uncertainty related to its morphological delimitation, distribution and conservation status. Efforts combining both field and herbarium investigations enabled us to identify several new populations in northern Brazil. In this study, we present a comprehensive assessment of the known distribution of I. luetzelburgii and provide a detailed description of the species. Because the holotype was never properly designated, we also provide the lectotypification for the name. The data presented here contribute to enhance our understanding of the taxonomy and natural history of this species. This understanding may also serve as a conservation tool for the protection of its populations.

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