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)

doi:10.3852/16-100

	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)
	Wang, Xiang-Hua 1,3; Huhtinen, Seppo 2; Hansen, Karen 1
	2016-11-01
发表期刊	MYCOLOGIA
卷号	108 期号:6 页码:1189-1215
摘要	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), Dl -D2 domains of nuc 28S rDNA (28S), translation elongation factor (tefl), 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. deceptive 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.
关键词	Gene Conflicts Genealogical Species Pyrophilous Taxonomy Type Studies
DOI	10.3852/16-100
收录类别	SCI
语种	英语
WOS记录号	WOS:000393269000011
引用统计	被引频次：14[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/41896
专题	中国科学院东亚植物多样性与生物地理学重点实验室
作者单位	1.Swedish Museum Nat Hist, Dept Bot, POB 50007, SE-10405 Stockholm, Sweden 2.Univ Turku, Herbarium, FI-20014 Turku, Finland 3.Chinese Acad Sci, Kunming Inst Bot, Key Lab Plant Divers Biogeog East Asia, Kunming 650201, Peoples R China
推荐引用方式 GB/T 7714	Wang, Xiang-Hua,Huhtinen, Seppo,Hansen, Karen. 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)[J]. MYCOLOGIA,2016,108(6):1189-1215.
APA	Wang, Xiang-Hua,Huhtinen, Seppo,&Hansen, Karen.(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.
MLA	Wang, Xiang-Hua,et al."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(2016):1189-1215.

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