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Phylogeny of the Hypochnicium punctulatum complex as inferred from ITS sequence data
R Henrik Nilsson1, Nils Hallenberg
1Botanical Institute, Göteborg University, Carl Skottsbergs Gata 22b, S-405 30 Göteborg, Sweden.
Mycologia
|December 16, 2010
Summary
Phylogenetic analysis of the Hypochnicium punctulatum complex using ITS sequences confirms species delimitations. Spore size clusters into four groups, aligning with phylogenetic findings, though some species show morphological overlap.
Area of Science:
- Mycology
- Molecular Systematics
- Basidiomycota
Background:
- The Hypochnicium punctulatum complex requires further investigation for accurate species delimitation.
- Previous studies relied on crossing tests for species boundaries within this complex.
Purpose of the Study:
- To investigate the Hypochnicium punctulatum complex using parsimony analysis of ITS sequence data.
- To confirm or refine existing species delimitations within the complex.
- To provide a key for species identification.
Main Methods:
- Parsimony analysis of Internal Transcribed Spacer (ITS) sequence data from 18 specimens.
- Measurement of spore sizes from sequenced specimens and type specimens.
- Phylogenetic analysis to correlate genetic data with morphological traits.
Main Results:
- The phylogenetic analysis strongly supports previously established species delimitations within the H. punctulatum complex.
- Spore sizes clustered into four distinct groups, consistent with phylogenetic results.
- Morphological delimitation between H. punctulatum and H. albostramineum proved challenging due to overlapping spore sizes.
- A new combination, Hypochnicium cremicolor, is proposed.
- Hypochnicium caucasicum is identified as a synonym of H. wakefieldiae.
Conclusions:
- ITS sequence data provides robust support for species boundaries in the Hypochnicium punctulatum complex.
- Spore size is a useful, though not always definitive, characteristic for species identification.
- Taxonomic revisions, including a new combination and synonymy, are proposed based on the findings.
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