Show simple item record Smith, Matthew E. en_US 2011-06-21T17:27:37Z 2011-06-21T17:27:37Z 2010 en_US
dc.identifier.citation Henkel,Terry W.;Smith,Matthew E.;Aime,M. Catherine. 2010. Guyanagaster, a New Wood-Decaying Sequestrate Fungal Genus Related to Armillaria (Physalacriaceae, Agaricales, Basidiomycota). American Journal of Botany 97(9): 1474-1484. en_US
dc.identifier.issn 0002-9122 en_US
dc.description.abstract Premise of the study : Sequestrate basidiomycete fungi (e. g. "gasteromycetes") have foregone ballistospory and evolved alternative, often elaborate mechanisms of basidiospore dispersal with highly altered basidioma morphology. Sequestrate fungi have independently evolved in numerous Agaricomycete lineages, confounding taxonomic arrangements of these fungi for decades. Understanding the multiple origins and taxonomic affinities of sequestrate fungi provides insight into the evolutionary forces that can drastically alter basidioma morphology. In the neotropical rainforests of the Guiana Shield, we encountered a remarkable sequestrate fungus fruiting directly on decaying hardwood roots. The fungus 'singular combination of traits include a wood-decaying habit; black, verrucose peridium; reduced stipe; and gelatinized basidiospore mass. Methods : Guyanagaster necrorhiza gen. et sp. nov. is described. Macro-and micromorphological characters were assessed and compared to most similar taxa. To determine the phylogenetic affinities of the fungus, DNA sequence data were obtained for the 18S, ITS, and 28S rDNA, RBP2, and EF1 alpha regions and subjected to single-and multi-gene analyses. DNA sequences from fungal vegetative organs growing on decaying woody roots confirmed the wood-inhabiting lifestyle of Guyanagaster. Key results : Guyanagaster is morphologically unique among sequestrate fungi worldwide. Phylogenetic evidence places Guyanagaster in close relation to the wood-decaying mushroom genus Armillaria in the Physalacriaceae (Agaricales, Agaricomycetes, Basidiomycota). Conclusions : Guyanagaster represents an independently evolved sequestrate form within the Physalacriaceae. Although molecular data confirm that Guyanagaster is closely related to Armillaria, the unusual features of this fungus suggest a case of radically divergent morphological evolution. en_US
dc.language.iso en_US en_US
dc.relation.isversionof doi:10.3732/ajb.1000097 en_US
dc.subject agaricomycetes en_US
dc.subject basidiomycetes en_US
dc.subject fungal taxonomy en_US
dc.subject gasteromycete syndrome en_US
dc.subject guyana en_US
dc.subject neotropics en_US
dc.subject rdna systematics en_US
dc.subject sequestrate fungi en_US
dc.subject statismosporic fungi en_US
dc.subject molecular phylogenetics en_US
dc.subject sequences en_US
dc.subject evolution en_US
dc.subject diversification en_US
dc.subject russulaceae en_US
dc.subject mushrooms en_US
dc.subject inference en_US
dc.subject boletales en_US
dc.subject truffle en_US
dc.subject primers en_US
dc.subject plant sciences en_US
dc.title Guyanagaster, a New Wood-Decaying Sequestrate Fungal Genus Related to Armillaria (Physalacriaceae, Agaricales, Basidiomycota) en_US
dc.title.alternative en_US
dc.description.version Version of Record en_US 2010-9-0 en_US
duke.description.endpage 1484 en_US
duke.description.issue 9 en_US
duke.description.startpage 1474 en_US
duke.description.volume 97 en_US
dc.relation.journal American Journal of Botany en_US

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