Phylogenetic assessment of global Suillus ITS sequences supports morphologically defined species and reveals synonymous and undescribed taxa

Nhu H. Nguyen, Else C. Vellinga, Thomas D. Bruns, Peter G Kennedy

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The genus Suillus represents one of the most recognizable groups of mushrooms in conifer forests throughout the Northern Hemisphere. Although for decades the genus has been relatively well defined morphologically, previous molecular phylogenetic assessments have provided important yet preliminary insights into its evolutionary history. We present the first large-scale phylogenetic study of the boundaries of each species in the genus Suillus based on the most current internal transcribed spacer (ITS) barcode sequences available inPUBLIC databases, as well as sequencing of 224 vouchered specimens and cultures, 15 of which were type specimens from North America. We found that species boundaries delimited by morphological data are broadly congruent with those based on ITS sequences. However, some species appear to have been described several times under different names, several species groups cannot be resolved by ITS sequences alone, and undescribed taxa are apparent, especially in Asia. Therefore, we elevated S. tomentosus var. discolor to S. discolor; proposed synonymies of S. neoalbidipes with S. glandulosipes, S. borealis with S. brunnescens, Boletus serotinus and B. solidipes with Suillus elbensis, S. lactifluus with S. granulatus, S. himalayensis with S. americanus; and proposed usage of the names S. clintonianus in the place of the North American S. grevillei, S. weaverae for North American S. granulatus, S. ampliporus in the place of the North American S. cavipes, and S. elbensis in place of the North American S. viscidus. We showed that the majority of Suillus species have strong affinities for particular host genera. Although deep node support was low, geographic differentiation was apparent, with species from North America, Eurasia, and Asia often forming their own clades. Collectively, this comprehensive genus-level phylogenetic integration of currently available Suillus ITS molecular data and metadata will aid future taxonomic and ecological work on an important group of ectomycorrhizal fungi.

Original languageEnglish (US)
Pages (from-to)1216-1228
Number of pages13
JournalMycologia
Volume108
Issue number6
DOIs
StatePublished - Nov 1 2016

Fingerprint

Suillus
North America
internal transcribed spacers
Names
Northern Asia
Coniferophyta
phylogenetics
Agaricales
phylogeny
Fungi
History
Databases
Suillus granulatus
Boletus
barcoding
Eurasia
type collections
metadata
mushrooms
type specimen

Keywords

  • Boletales
  • Suillaceae
  • bolete
  • geography
  • molecular phylogenetics
  • suilloid
  • systematics
  • taxonomy

Cite this

Phylogenetic assessment of global Suillus ITS sequences supports morphologically defined species and reveals synonymous and undescribed taxa. / Nguyen, Nhu H.; Vellinga, Else C.; Bruns, Thomas D.; Kennedy, Peter G.

In: Mycologia, Vol. 108, No. 6, 01.11.2016, p. 1216-1228.

Research output: Contribution to journalArticle

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