title: Evolution in action: molecular evidence for recent emergence of secotioid genera Endxoptychum, Gyrophragmium and Longula from Agaricus ancestors.
abstract: Phylogenetic analyses of 29 Agaricus species and one representative from genera Endoptychum, Gyrophragmium and Longula each were conducted based on sequence data of the entire internal transcribed spacers and partial large subunit of ribosomal DNA. The Agaricus species formed several distinct clades both confirming and challenging previous morphological sections in several cases. Endoptychum depressum, Gyrophragmium dunalii and Longula texensis were nested among species of the genus Agaricus. This study provides evidence for independent emergence of these secotioid fungi from Agaricus ancestors, most likely from species placed in the section Arvenses as inferred from molecular data.
authors.affiliation: Institute of Molecular Evolutionary Genetics and Department of Plant Pathology, The Pennsylvania State University, University Park 16802, USA. jig5@psu.edu
authors.forename: J
authors.initials: J
authors.lastname: Geml
mesh_terms: D000363:Agaricales / Q000145:classification / Q000235:genetics*; D000364:Agaricus / Q000235:genetics*; D004271:DNA, Fungal / Q000032:analysis; D021903:DNA, Ribosomal Spacer / Q000032:analysis; D019143:Evolution, Molecular; D010802:Phylogeny; D017422:Sequence Analysis, DNA
chemical_list: D004271:DNA, Fungal; D021903:DNA, Ribosomal Spacer