Molecular data show that Hypotrachyna sorocheila (Parmeliaceae) is not monophyletic
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Date
2016Author
Kirika, Paul M.
Divakar, Pradeep K.
Crespo, Ana
Gatheri, Grace W.
Mugambi, George
Leavitt, Steven D.
Moncada, Bibiana
Lumbsch, H. Thorsten
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Lichens that reproduce by means of vegetative propagules (soredia or isidia) are generally
thought to have broad geographic distributions. However, recent studies have shown that some asexually
reproducing lichens with broad distribution may be comprised of multiple, independent species-level
lineages. Our understanding of species diversity in asexually reproducing lichenized fungal species may be
further confounded by the fact that otherwise morphologically similar taxa separated based on the
presence or absence of vegetative reproductive structures may in fact be conspecific. In this study, we
investigate genetic diversity of the pantropical sorediate species Hypotrachyna sorocheila using molecular
sequence data. Specifically, we generated a three-marker dataset for Hypotrachyna subgen. Everniastrum
specimens, and reconstructed a multilocus, molecular phylogeny. Our results show that sorediate samples
phenotypically identifiable as H. sorocheila do not form a monophyletic group, but form two distinct
species-level lineages. Although our data support the pantropical distribution of H. sorocheila s.str.,
including populations in East Africa, a distinct species-level clade was found in Asia and is described as a
new species here, H. himalayana Divakar & Kirika sp. nov. This study highlights the fact that the
taxonomic significance of reproductive traits may vary among lineages of lichen-forming fungi, and that
there is need for careful case-by-case studies
URI
http://www.bioone.org/doi/full/10.1639/0007-2745-119.2.172http://repository.must.ac.ke/handle/123456789/588