A re-evaluation of genus Chaetomidium based on molecular and morphological characters

Matthew D. Greif, Alberto M. Stchigel, Andrew N. Miller, Sabine M. Huhndorf

Research output: Contribution to journalArticle

Abstract

Chaetomidium, a genus in the Chaetomia-ceae, comprises 12 species that produce similar cleistothecial ascomata with a membranous, mostly pilose, peridium. Approximately six species of this genus produce some type of modified peridium composed of cephalothecoid plates that previous authors have hypothesized to be a homologous character within the genus. To better understand the phylogenetic affiliations of Chaetomidium and distribution of the cephalothecoid peridium within this genus we performed phylogenetic analyses with LSU, β-tubulin and rpb2 sequence data. The results of these analyses showed that Chaetomidium is polyphy-letic and should be restricted to its type, C. fimeti, and C. subfimeti. The remaining cephalothecoid and non-cephalothecoid species were scattered throughout the Chaetomiaceae and Lasiosphaeriaceae. The cepha-lothecoid species of Chaetomidium were distributed in three unrelated clades, suggesting that the morphological similarity among these particular species resulted from convergence instead of ancestry.

Original languageEnglish (US)
Pages (from-to)554-564
Number of pages11
JournalMycologia
Volume101
Issue number4
DOIs
StatePublished - Jul 1 2009

Keywords

  • Cephalothecoid
  • Chaetomiaceae
  • Phylogeny
  • Sordariales
  • Systematics

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Physiology
  • Molecular Biology
  • Genetics
  • Cell Biology

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