Tryonia, a new taenitidoid fern genus segregated from Jamesonia and Eriosorus (Pteridaceae)

By

Cochran, Alyssa
Prado, Jefferson
Schuettpelz, Eric, 1977-

Type

Article

Date of Publication

2014

Original Publication

PhytoKeys

Volume

35

Pages

23-43

Subjects

Brazil , Phylogeny , pteridophytes , Taenitidoideae , taxonomy

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers [2010]-

Identifiers

DOI: https://doi.org/10.3897/phytokeys.35.6886

 

Abstract

The Neotropical fern genera Eriosorus and Jamesonia have long been thought of as close relatives. Molecular phylogenetic studies have confirmed this notion but have also revealed that neither genus is monophyletic with respect to the other. As a result, all known species of Eriosorus were recently subsumed under the older generic name Jamesonia. Here, through an analysis of a four-gene plastid dataset, we show that several species traditionally treated in Eriosorus are in fact more closely related to other taenitidoid fern genera (namely Austrogramme, Pterozonium, Syngramma, and Taenitis) than they are to the large Jamesonia sensu lato clade. Tryonia Schuettp., J.Prado & A.T.Cochran gen. nov. is described to accommodate these species and four new combinations are provided. Tryonia is confined to southeastern Brazil and adjacent Uruguay; it is distinct (from most species of Jamesonia) instramineous rachises.