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dc.contributor.authorAime, Mary Catherineen
dc.date.accessioned2014-03-14T20:11:35Zen
dc.date.available2014-03-14T20:11:35Zen
dc.date.issued2001-05-01en
dc.identifier.otheretd-05052001-173519en
dc.identifier.urihttp://hdl.handle.net/10919/27546en
dc.description.abstractFungi of the Crepidotaceae are characterized by saprotrophic habit, filamentous cuticle, and brown-pigmented basidiospores that lack either a germ pore or plage. The majority of species belong to Crepidotus, distinguished by their pleurotoid basidiomata. Because of their diverse morphology, the presence of several conflicting classifications, and lack of data regarding the biology, phenotypic plasticity, or phylogeny of these fungi, the present study sought first to determine phylogenetic relationships among the different taxonomic groups as a basis for addressing other aspects of Crepidotus biology and evolution. Sequencing analyses show the Crepidotaceae is not monophyletic, and the family concept is revised. Crepidotus and its sister genus Simocybe are found to be monophyletic. At least nine phylogenetic lineages within Crepidotus were uncovered, although relationships between them could not be resolved. However, none of the previously proposed infrageneric classifications are reflective of phylogeny. Morphological, biological, and phylogenetic species concepts were compared within a single phylogenetic unit, termed the Sphaerula group, showing an unusual amount of phenotypic plasticity exists within species, and a taxonomic revision of these species proposed. Also reported are several unique or unusual aspects of Crepidotus biology, including presence of a prolonged latent period prior to basidiospore germination; spontaneous reversion of differentiated hymenial cells to vegetative growth; and the revelation that structures previously termed pleurocystidia are actually the expression of secondary growth from basidia. Results from mating system, culture, and type studies, reassessment of morphological characters traditionally applied to agaric taxonomy, and a revised life cycle for the Crepidoti are presented.en
dc.publisherVirginia Techen
dc.relation.haspartfinal.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectMelanomphaliaen
dc.subjectmorphogenesisen
dc.subjectTubariaen
dc.subjectspecies conceptsen
dc.subjectPleurotellusen
dc.subjectfungal biologyen
dc.titleBiosystematic Studies in Crepidotus and the Crepidotaceae (Basidiomycetes, Agaricales)en
dc.typeDissertationen
dc.contributor.departmentBiologyen
dc.description.degreePh. D.en
thesis.degree.namePh. D.en
thesis.degree.leveldoctoralen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.disciplineBiologyen
dc.contributor.committeechairMiller, Orson K. Jr.en
dc.contributor.committeememberPorter, Duncan M.en
dc.contributor.committeememberScheckler, Stephen E.en
dc.contributor.committeememberVilgalys, Rytas J.en
dc.contributor.committeememberFalkinham, Joseph O. IIIen
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05052001-173519/en
dc.date.sdate2001-05-05en
dc.date.rdate2002-05-07en
dc.date.adate2001-05-07en


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