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Citation for Study 18974

Citation title: "Multilocus phylogenetic and coalescent-based methods reveal dilemma in generic limits, cryptic species and a prevalent intercontinental disjunct distribution in Geopyxis (Pyronemataceae s. l., Pezizomycetes)".

Study name: "Multilocus phylogenetic and coalescent-based methods reveal dilemma in generic limits, cryptic species and a prevalent intercontinental disjunct distribution in Geopyxis (Pyronemataceae s. l., Pezizomycetes)".

This study is part of submission 18974 (Status: Published).

Citation

Wang X., Huhtinen S., & Hansen K. 2016. Multilocus phylogenetic and coalescent-based methods reveal dilemma in generic limits, cryptic species and a prevalent intercontinental disjunct distribution in Geopyxis (Pyronemataceae s. l., Pezizomycetes). Mycologia , 108(6): 1189-1215.

Authors

• Wang X. 0046-767830867
• Huhtinen S.
• Hansen K. +46 (0)8 5195 4248

Abstract

Species limits in the small genus Geopyxis are debatable because of problems with interpreting the few phenotypic features and poor documentation of types. To clarify species boundaries and diversity, we studied the morphology of 74 specimens of Geopyxis from the Northern Hemisphere, including five types, and sequenced four loci for 57 representatives: the nuc rDNA ITS1-5.8S-ITS2 (ITS), D1-D2 domains of nuc 28S rDNA (28S), translation elongation factor (tef1), and (or) part of the second largest subunit of the RNA polymerase II (rpb2) (5?7 region). Eight species are delimited. Six species are shown to be highly supported as reciprocally monophyletic: G. aleurioides sp. nov., G. alpina s. l., G. carbonaria, G. delectans, G. korfii, and G. majalis. In addition, coalescent-based Bayesian species delimitation shows G. alpina s. l. constitutes three cryptic species: G. alpina s. str., G. deceptiva sp. nov., and G. rehmii. ITS-28S sequences of type material show that G. vulcanalis and G. foetida are synonyms of G. carbonaria. A lectotype is designated for Humaria delectans and the name is combined in Geopyxis. Morphological characters that can be used to distinguish Geopyxis species are presence/absence of a long stipe, spore size and shape, and pigmented resinous exudates in medullary and ectal excipulum. Geopyxis carbonaria and G. delectans produce apothecia almost exclusively on burned ground. Bayesian analyses detected highly supported conflicts among different loci regarding generic delimitation and species relationships. Two hypogeous genera, Stephensia and Hydnocystis, are confirmed to nest within Geopyxis. The relationships between species of Geopyxis and Tarzetta, Stephensia shanorii and Paurocotylis pila, are unresolved. Six out of eight species of Geopyxis recognized in this study have intercontinental disjunct distributions.

Keywords

genealogical species, gene conflicts, pyrophilous, taxonomy, type studies

External links

• DOI: 10.3852/16-100

About this resource

• Canonical resource URI: http://purl.org/phylo/treebase/phylows/study/TB2:S18974
• Other versions: Nexus NeXML
• Show BibTeX reference

  		@ARTICLE{TreeBASE2Ref25637,
  	 author = {Xianghua  WANG and Seppo  Huhtinen and Karen  Hansen},
  	 title = {Multilocus phylogenetic and coalescent-based methods reveal dilemma in generic limits, cryptic species and a prevalent intercontinental disjunct distribution in Geopyxis (Pyronemataceae s. l., Pezizomycetes)},
  	 year = {2016},
  	 keywords = {genealogical species, gene conflicts, pyrophilous, taxonomy, type studies},
  	 doi = {10.3852/16-100},
  	 url = {http://},
  	 pmid = {},
  	 journal = {Mycologia },
  	 volume = {108},
  	 number = {6},
  	 pages = {1189--1215},
  	 abstract = {Species limits in the small genus Geopyxis are debatable because of problems with interpreting the few phenotypic features and poor documentation of types. To clarify species boundaries and diversity, we studied the morphology of 74 specimens of Geopyxis from the Northern Hemisphere, including five types, and sequenced four loci for 57 representatives: the nuc rDNA ITS1-5.8S-ITS2 (ITS), D1-D2 domains of
  nuc 28S rDNA (28S), translation elongation factor (tef1), and (or) part of the second largest subunit of the RNA polymerase II (rpb2) (5?7 region). Eight species are delimited. Six species are shown to be highly supported as reciprocally monophyletic: G. aleurioides sp. nov., G. alpina s. l., G. carbonaria, G. delectans, G. korfii, and G. majalis. In addition, coalescent-based Bayesian species delimitation shows G. alpina s. l. constitutes three cryptic species: G. alpina s. str., G. deceptiva sp. nov., and G. rehmii. ITS-28S sequences of type
  material show that G. vulcanalis and G. foetida are synonyms of G. carbonaria. A lectotype is designated for Humaria delectans and the name is combined in Geopyxis. Morphological characters that can be used to distinguish Geopyxis species are presence/absence of a long stipe, spore size and shape, and pigmented resinous
  exudates in medullary and ectal excipulum. Geopyxis carbonaria and G. delectans produce apothecia almost exclusively on burned ground. Bayesian analyses detected highly supported conflicts among different loci regarding generic delimitation and species relationships. Two hypogeous genera, Stephensia and Hydnocystis, are confirmed to nest within Geopyxis. The relationships between species of Geopyxis and Tarzetta, Stephensia shanorii and Paurocotylis pila, are unresolved. Six out of eight species of Geopyxis recognized in this study have intercontinental disjunct distributions.}
  }
  		

• Show RIS reference

  		TY  - JOUR
  ID  - 25637
  AU  - WANG,Xianghua 
  AU  - Huhtinen,Seppo 
  AU  - Hansen,Karen 
  T1  - Multilocus phylogenetic and coalescent-based methods reveal dilemma in generic limits, cryptic species and a prevalent intercontinental disjunct distribution in Geopyxis (Pyronemataceae s. l., Pezizomycetes)
  PY  - 2016
  KW  - genealogical species
  KW  - gene conflicts
  KW  - pyrophilous
  KW  - taxonomy
  KW  - type studies
  UR  - http://dx.doi.org/10.3852/16-100
  N2  - Species limits in the small genus Geopyxis are debatable because of problems with interpreting the few phenotypic features and poor documentation of types. To clarify species boundaries and diversity, we studied the morphology of 74 specimens of Geopyxis from the Northern Hemisphere, including five types, and sequenced four loci for 57 representatives: the nuc rDNA ITS1-5.8S-ITS2 (ITS), D1-D2 domains of
  nuc 28S rDNA (28S), translation elongation factor (tef1), and (or) part of the second largest subunit of the RNA polymerase II (rpb2) (5?7 region). Eight species are delimited. Six species are shown to be highly supported as reciprocally monophyletic: G. aleurioides sp. nov., G. alpina s. l., G. carbonaria, G. delectans, G. korfii, and G. majalis. In addition, coalescent-based Bayesian species delimitation shows G. alpina s. l. constitutes three cryptic species: G. alpina s. str., G. deceptiva sp. nov., and G. rehmii. ITS-28S sequences of type
  material show that G. vulcanalis and G. foetida are synonyms of G. carbonaria. A lectotype is designated for Humaria delectans and the name is combined in Geopyxis. Morphological characters that can be used to distinguish Geopyxis species are presence/absence of a long stipe, spore size and shape, and pigmented resinous
  exudates in medullary and ectal excipulum. Geopyxis carbonaria and G. delectans produce apothecia almost exclusively on burned ground. Bayesian analyses detected highly supported conflicts among different loci regarding generic delimitation and species relationships. Two hypogeous genera, Stephensia and Hydnocystis, are confirmed to nest within Geopyxis. The relationships between species of Geopyxis and Tarzetta, Stephensia shanorii and Paurocotylis pila, are unresolved. Six out of eight species of Geopyxis recognized in this study have intercontinental disjunct distributions.
  L3  - 10.3852/16-100
  JF  - Mycologia 
  VL  - 108
  IS  - 6
  SP  - 1189
  EP  - 1215
  ER  -