Dryopteris × subdiffracta (Dryopteridaceae), a new natural hybrid fern from Guangxi, China

By

Wei, Hongjin
Zuo, Zheng-Yu

Type

Article

Date of Publication

2024

Original Publication

PhytoKeys

Volume

250

Pages

7--19

Subjects

Dryopteris sect. Acrorumohra , Hybridization , molecular phylogeny , nuclear gene AK1 , plastome

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers [2010]-

Identifiers

DOI: https://doi.org/10.3897/phytokeys.250.119803

 

Abstract

A new natural hybrid fern, Dryopteris × subdiffracta (Dryopteridaceae), is reported from Guangxi, China. Molecular phylogenetic analysis based on DNA sequences from the low-copy nuclear marker Ak1 and plastid genome revealed respectively that D. polita and D. diffracta are parents of the new hybrid, with D. polita as the maternal parent. Cytometric analysis of the nuclear DNA content indicated that D. × subdiffracta might be a diploid hybrid. Morphologically, D. × subdiffracta shares a high degree of similarity with D. × subreflexipinna from Taiwan, especially in zigzag-shaped rachis and deflexed pinna stalks. However, D. × subdiffracta is distinguishable in the degree of lamina division and shapes of lamina and pinnulets. A comprehensive taxonomic description accompanied by line drawings are provided.