Papers by Gregory Mueller
Mycologia, Sep 1, 1999
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Brittonia, Sep 30, 2002
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ABSTRACT
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Mycologia
ABSTRACT
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ABSTRACT
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Mycologia
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Mycologia
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Veterinary and human toxicology
A new program, Fungal Identification System (FIS) was introduced in POISINDEX (PI) in 1991. We st... more A new program, Fungal Identification System (FIS) was introduced in POISINDEX (PI) in 1991. We studied the accuracy of this program compared to the traditional method of consulting an expert mycologist and also the utility of FIS for the certified specialist in poison information (CSPI) and the emergency department personnel. Fifteen samples were obtained from a Chicago area forest preserve and immediately identified by a CSPI using FIS from PI of summer-fall 1991. The samples were then refrigerated overnight and identified the following morning by a PhD mycologist, using standard mycological identification techniques (SMIT). Another group of 18 mushrooms were collected in August 1992 from rural southwestern Michigan and identified by FIS and SMIT after refrigeration overnight. In 4 cases the mycologist used both SMIT and FIS to identify the mushrooms. Identification by FIS did not match SMIT in 27 of 31 samples (1 was discarded and 1 was identified by FIS but not identified by SMIT). In 2 of 4 cases where the mycologist used FIS, a different answer was obtained from that obtained by the CSPI; however, these were still incorrect identifications. Four types of problems using FIS have been identified which can lead to erroneous results; these are the use of multipart questions, emphasis on color over less variable characteristics, questions which do not account for variability in morphology, and problems which arise from the sequence of questions. These points need to be addressed before FIS can be used as a safe basis for clinical recommendations.
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Mycologia
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Molecular Phylogenetics and Evolution, 2004
The lichen-forming genus Porpidia (Porpidiaceae, Ascomycota) provides excellent opportunities for... more The lichen-forming genus Porpidia (Porpidiaceae, Ascomycota) provides excellent opportunities for evolutionary, reproductive, and ecological studies of crustose epilithic lichen symbioses. However, despite the fact that the genus itself seemed to be clearly delimited, the group was thought to be a hopeless case with regard to intrageneric relationships and species delimitations due to apparently rampant homoplasy throughout most character systems. Contrary to the situation for non-molecular data, a robust and generally well-resolved phylogeny was recovered based on DNA-sequence data. Separate and combined analyses of nuclear ribosomal RNA large subunit and nuclear beta-tubulin gene fragments were performed using maximum parsimony, maximum likelihood, and Bayesian approaches. Branch support was estimated using non-parametic bootstrapping and posterior probabilities, while monophyly of a priori defined groups was tested using posterior probabilities. The results reveal a highly supported "Porpidia sensu lato," however, Porpidia itself is not monophyletic. Several smaller genera of the Porpidiaceae and probably the large genus Lecidea (Lecideaceae) are nested within the group. Most taxa analyzed fall into one of four major subgroups within Porpidia s.l., though the basal relationships among these subgroups could not be supported. This phylogeny will make it possible to re-evaluate morphological and chemical characters in the group, and to conduct detailed studies of species delimitations within the monophyletic subgroups.
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Mycologia, 1991
ABSTRACT
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Biodiversity of Fungi, 2004
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Mycologia, 1999
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Science of The Total Environment, 1998
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Nordic Journal of Botany, 1991
... mostly 3-20 pm diam, thin-walled, hyaline to light yel-lowish brown or vinaceous brown; cells... more ... mostly 3-20 pm diam, thin-walled, hyaline to light yel-lowish brown or vinaceous brown; cells long, barrel-shaped. ... Basidiospores globose to oblong and echinulate or very elongate and very finely roughened, occasionally un-iguttulate, hyaline; hilar appendage prominent, trun ...
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New Phytologist, 2008
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Mycotaxon, 2010
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Mycoscience, 2013
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Papers by Gregory Mueller