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    Diversity and taxonomy of Chaetomium and chaetomium-like fungi from indoor environments

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    Author
    Wang, XW; Houbraken, J; Groenewald, JZ; Meijer, M; Andersen, B; Nielsen, KF; Crous, PW; Samson, RA
    Date
    2016-06-01
    Source Title
    Studies in Mycology
    Publisher
    CENTRAALBUREAU SCHIMMELCULTURE
    University of Melbourne Author/s
    CROUS, PIETER
    Affiliation
    Agriculture and Food Systems
    Metadata
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    Document Type
    Journal Article
    Citations
    Wang, X. W., Houbraken, J., Groenewald, J. Z., Meijer, M., Andersen, B., Nielsen, K. F., Crous, P. W. & Samson, R. A. (2016). Diversity and taxonomy of Chaetomium and chaetomium-like fungi from indoor environments. STUDIES IN MYCOLOGY, 84 (84), pp.145-224. https://doi.org/10.1016/j.simyco.2016.11.005.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/255489
    DOI
    10.1016/j.simyco.2016.11.005
    Abstract
    During a study of indoor fungi, 145 isolates belonging to Chaetomiaceae were cultured from air, swab and dust samples from 19 countries. Based on the phylogenetic analyses of DNA-directed RNA polymerase II second largest subunit (rpb2), β-tubulin (tub2), ITS and 28S large subunit (LSU) nrDNA sequences, together with morphological comparisons with related genera and species, 30 indoor taxa are recognised, of which 22 represent known species, seven are described as new, and one remains to be identified to species level. In our collection, 69 % of the indoor isolates with six species cluster with members of the Chaetomium globosum species complex, representing Chaetomium sensu stricto. The other indoor species fall into nine lineages that are separated from each other with several known chaetomiaceous genera occurring among them. No generic names are available for five of those lineages, and the following new genera are introduced here: Amesia with three indoor species, Arcopilus with one indoor species, Collariella with four indoor species, Dichotomopilus with seven indoor species and Ovatospora with two indoor species. The generic concept of Botryotrichum is expanded to include Emilmuelleria and the chaetomium-like species B. muromum (= Ch. murorum) in which two indoor species are included. The generic concept of Subramaniula is expanded to include several chaetomium-like taxa as well as one indoor species. Humicola is recognised as a distinct genus including two indoor taxa. According to this study, Ch. globosum is the most abundant Chaetomiaceae indoor species (74/145), followed by Ch. cochliodes (17/145), Ch. elatum (6/145) and B. piluliferum (5/145). The morphological diversity of indoor Chaetomiaceae as well as the morphological characteristics of the new genera are described and illustrated. This taxonomic study redefines the generic concept of Chaetomium and provides new insight into the phylogenetic relationships among different genera within Chaetomiaceae.

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