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Abstract Detail


MSA - Systematics/Evolution

Methven, Andrew S. [1], Hughes, Karen W. [2], Petersen, Ron [3].

Species Complexes in Section Lactifluus of the Ectomycorrhizal Mushroom Genus Lactarius.

As part of a preliminary study of species in Section Lactifluus in the ectomycorrhizal mushroom genus Lactarius, collections of “Lactarius volemus” and allied taxa from the Great Smoky Mountains National Park were compared with each other, collections from Europe, and environmental samples using sequences of the ribosomal ITS region. While L. luteolus, L. hygrophoroides, and L. corrugis are represented as distinct clades, collections of L. volemus were divided into six clades. Clade 1 contained a collection from the Great Smoky Mountains National Park and an environmental sample from the southern Appalachians. Clade 1 affiliates with L. corrugis and L. volemus and its’ position in the phylogeny is not entirely clear. Clade 2 consists of three collections from the Great Smoky Mountains National Park and an environmental sample from the southern Appalachians. Clade 3 comprises two collections of L. volemus var. flavus originally described by Hesler and Smith from the southeastern United States. Clade 4 consists of a collection from Sweden and an environmental sample from Italy. Clade 5 includes one collection from western Russia and two collections from Sweden and may represent authentic L. volemus. Clade 6 is genetically divergent from all other L. volemus clades and consists of three closely related collections from the Great Smoky Mountains National Park and a collection labeled as L. volemus from France. While individual clades of L. volemus are well-supported, with the exception of clade 2 where relationships within the clade are ambiguous, the relationship amongst clades 2, 3, 4, 5 and 6 is not entirely clear. Based on ITS sequences, it appears that L. volemus is not a single entity but is composed of several species or subspecies.


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1 - Eastern Illinois University, Department of Biological Sciences, 600 Lincoln Ave, Charleston, Illinois, 61920-3099, USA
2 - University of Tennessee, Knoxville, Ecology and Evolutionary Biology, 422 Hesler Biology Building, Knoxville, TN, 37996-0830, USA
3 - University of Tennessee, Ecology and Evolutionary Biology, Knoxville, TN, 37996-1100, USA

Keywords:
Great Smoky Mountains National Park
Lactarius
Section Lactifluus.

Presentation Type: Poster:Posters for Topics
Session: P2
Location: Event Tent/Cliff Lodge
Date: Tuesday, July 28th, 2009
Time: 5:30 PM
Number: P2SE016
Abstract ID:202


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