Journal
MYCOLOGIA
Volume 106, Issue 4, Pages 757-784Publisher
TAYLOR & FRANCIS INC
DOI: 10.3852/13-298
Keywords
Ceratocystidaceae; Microascales; phylogenetic species concept; Thielaviopsis
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Funding
- Department of Corporate International Affairs of the University of Pretoria,
- Department of Science and Technology (DST) /National Research Foundation (NRF) Center of Excellence in Tree Health Biotechnology (CTHB)
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The Ceratocystis paradoxa complex accommodates a group of fungal pathogens that have become specialized to infect mostly monocotyledonous plants. Four species currently are recognized in this group, including C. paradoxa, which has a widespread distribution and broad host range. In this study, multigene phylogenetic analyses involving sequences of the ITS, beta-tubulin and TEF-1 alpha gene loci, in combination with phenotypic and mating studies, were used to characterize purported C. paradoxa isolates from Cameroon and to compare them with isolates from elsewhere, including protologs and type specimens of known species. We show that the C. paradoxa complex comprises substantially greater species diversity than previously recognized. One new species in this group is described from Cameroon as Ceratocystis cerberus, while C. paradoxa sensu stricto (s. str.) and four other species are redefined. Lectotypes are designated for C. ethacetica and Endoconidium fragrans (synonym of C. ethacetica), while epitypes are designated for C. paradoxa s. str., C. ethacetica and C. musarum. A neotype is designated for Catenularia echinata (synonym of C. ethacetica) and two species, previously treated in Thielaviopsis, are transferred to Ceratocystis.
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