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DOI: 10.3852/08-200
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Mycologia, 101(4), 2009, pp. 554-564.
© 2009 by The Mycological Society of America

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


Matthew D. Greif 1

     Field Museum of Natural History, 1400 S. Lakeshore Drive, Chicago, Illinois 60605

Alberto M. Stchigel

     Unitat de Microbiologia, Universitat Rovira i Virgili, 43201 Reus, Spain

Andrew N. Miller

     Section for Biodiversity, Illinois Natural History Survey, Champaign, Illinois 61820-6970

Sabine M. Huhndorf

     Field Museum of Natural History, 1400 S. Lakeshore Drive, Chicago, Illinois 60605

Chaetomidium, a genus in the Chaetomiaceae, 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 polyphyletic 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 cephalothecoid species of Chaetomidium were distributed in three unrelated clades, suggesting that the morphological similarity among these particular species resulted from convergence instead of ancestry.

Key words: cephalothecoid, Chaetomiaceae, phylogeny, Sordariales, systematics

1 Corresponding author. E-mail: mgreif{at}fieldmuseum.org






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Copyright © 2009 by The Mycological Society of America.