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Abstract Detail

MSA - Systematics/Evolution

Lodge, D. Jean [1], Hughes, Karen W. [2].

Species complexes in Hygrophoraceae compared between the Great Smoky Mt. National Park and Europe, including a hybrid.

Three species complexes in the Hygrophoraceae were studied using ITS sequences from the Great Smoky Mt. Nat. Park, eastern N. America and Europe. Section Chlorophanae is a difficult complex comprised of two main clades with ITS sequences that differ by 9-10%: a strictly American clade that may represent H. flavescens; and an H. chlorophana clade, comprised of a basal European clade and a highly branched, distal American clade with diverse morphologies. One H. glutinipes specimen from the Smokies is apparently a hybrid as two of its clones fell in the American H. chlorophana clade while one clone was intermediate between the two major clades. Phylogenies of white Camarophyllus species had a similar topology, with an American C. borealis clade; and a C. virgineus clade represented on both sides of the Atlantic. All sequences from the Smokies and New England fell into the C. borealis clade suggesting it may be restricted to cool habitats, while some environmental samples from eastern North Carolina (Duke Forest) fell in the C. virgineus clade together with samples from Hungary and England. One collection from Scotland was intermediate between C. borealis and C. virgineus, and may represent a hybrid or a common ancestor. In the non-staining Hygrocybe conica complex, an American species, H. acutoconica, differed by less than 3% from European H. persistens, so they may be considered conspecific with H. acutoconica having priority. The American species, H. cuspidata, is also conspecific with H. acutoconica. Characters such as thickness of the viscid layer on the stipe (H. chlorophana complex) or pileus (white Camarophyllus and non-staining H. conica group) are uninformative. Hybridization may contribute to the difficulty in classifying species in some groups of Hygrophoraceae.

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1 - US Dept. Agriculture-Forest Service, Northern Research Station, PO Box 1377, Luquillo, PR, 00773-1377
2 - University of Tennessee, Knoxville, Ecology and Evolutionary Biology, 422 Hesler Biology Building, Knoxville, TN, 37996-0830, USA

hybrid speciation.

Presentation Type: Poster:Posters for Topics
Session: P2
Location: Event Tent/Cliff Lodge
Date: Tuesday, July 28th, 2009
Time: 5:30 PM
Number: P2SE010
Abstract ID:183