Phylogenetic placement of Geastrum melanocephalum and polyphyly of Geastrum triplex

Taiga Kasuya, Kentaro Hosaka, Kunihiko Uno, Makoto Kakishima

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Geastrum melanocephalum, originally described as Trichaster melanocephalus, is characterized by large basidiomata and an evanescent endoperidium. Although Trichaster was recently treated as a synonym of Geastrum and the specific name G. melanocephalum has often been used, it is still controversial whether Trichaster is an independent genus. Although a close affinity of G. melanocephalum and G. triplex has been suggested based on some morphological similarities, it is highly likely that G. triplex is polyphyletic because of its high morphological variability. To clarify the phylogenetic position of G. melanocephalum, it is therefore critical to evaluate the monophyly of G. triplex. This study sampled ITS, LSU, and atp6 genes from 144 specimens of Geastrales including G. melanocephalum and G. triplex from several continents. Results of phylogenetic analyses demonstrated G. melanocephalum is nested within Geastrum and is most closely related to the European and North American group of G. triplex. Morphological similarities of G. melanocephalum and European and North American G. triplex are also suggested. Based on phylogenetic and morphological evidence, we confirm Trichaster is a synonym of Geastrum, and the scientific name Geastrum melanocephalum should be accepted. Moreover, the present study revealed that taxa tentatively identified as "G. triplex" are highly polyphyletic, and a taxonomic revision of "G. triplex" is therefore needed.

Original languageEnglish
Pages (from-to)411-426
Number of pages16
JournalMycoscience
Volume53
Issue number6
DOIs
Publication statusPublished - 2012 Jan 1
Externally publishedYes

Fingerprint

Geastrum
polyphyly
phylogenetics
phylogeny
Geastrales
basidiomata
taxonomic revisions
gene
monophyly

Keywords

  • Basidiomycota
  • Geastrales
  • Phylogeography
  • Taxonomy
  • Trichaster

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

Cite this

Phylogenetic placement of Geastrum melanocephalum and polyphyly of Geastrum triplex. / Kasuya, Taiga; Hosaka, Kentaro; Uno, Kunihiko; Kakishima, Makoto.

In: Mycoscience, Vol. 53, No. 6, 01.01.2012, p. 411-426.

Research output: Contribution to journalArticle

Kasuya, Taiga ; Hosaka, Kentaro ; Uno, Kunihiko ; Kakishima, Makoto. / Phylogenetic placement of Geastrum melanocephalum and polyphyly of Geastrum triplex. In: Mycoscience. 2012 ; Vol. 53, No. 6. pp. 411-426.
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