Isoetes nana, a new species from the coastal mountains of southeastern Brazil

By

Pereira, Jovani
Stutzel, Thomas
Schulz, Christian

Type

Article

Date of Publication

2017

Original Publication

PhytoKeys

Volume

89

Pages

91-105

Subjects

aquatic plant , endemism , Lycophytes , spore , taxonomy

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers [2010]-

Identifiers

DOI: https://doi.org/10.3897/phytokeys.89.20171

 

Abstract

Isoetes nana, a new species from the coastal mountains of southeastern Brazil (Serra de Itatiaia), is described, illustrated and compared to similar species. This species can be distinguished from similar species by a set of characters that include 5–15 small erect leaves reaching only up to 3.5cm long, megaspores rugulate (rarely laevigate or obscurely cristate) and microspores sparsely echinate. We include a key to identify this new species and spore images for all species that are discussed in this study. Isoetes nana is known only from the type locality, where it was reported to occur in small ponds on rocky outcrops at high elevations. We suggest it should be classified as a data deficient species based on the IUCN criteria.