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Sexual Crosses with the Mucoromycete Phycomyces blakesleeanus

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Stipitate stereoid basidiocarps have evolved multiple times.

Elisabet Sjökvist¹, Ellen Larsson, Ursula Eberhardt

¹University of Gothenburg, Department of Plant and Environmental Sciences, Göteborg, Sweden. elisabet.sjokvist@bioenv.gu.se

|April 12, 2012

Summary

This summary is machine-generated.

Molecular phylogenetic analyses reveal new classifications for stipitate stereoid fungi. Some species, like Stereopsis vitellina, are placed in new orders, while genera like Cymatoderma require revision.

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Sexual Development and Ascospore Discharge in Fusarium graminearum

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Area of Science:

Mycology
Basidiomycetes classification
Molecular Phylogenetics

Background:

Stipitate stereoid fungi are characterized by a stipe, pileus, smooth hymenophore, and hyaline spores.
Previous classifications of these fungi have not fully resolved their evolutionary relationships.
Genera like Cotylidia, Cymatoderma, Muscinupta, Podoscypha, and Stereopsis represent key groups within stipitate stereoid fungi.

Purpose of the Study:

To clarify the phylogenetic positions of stipitate stereoid fungi using molecular data.
To investigate the taxonomic placement of type species within selected genera.
To provide a more accurate classification of Basidiomycetes based on genetic evidence.

Main Methods:

Molecular phylogenetic analyses were conducted using nuclear ribosomal large subunit, 5.8S, and ITS sequences.
Type species for four genera (Cotylidia, Cymatoderma, Muscinupta, Stereopsis) were included in the analyses.
Phylogenetic trees were constructed to infer evolutionary relationships.

Main Results:

Stereopsis radicans, the type species of Stereopsis, forms a distinct lineage not fitting current Agaricomycotina orders.
Stereopsis vitellina was placed within the Atheliales, representing the first stipitate fungus in this order.
Cotylidia and Muscinupta are confirmed members of the Hymenochaetales.
Cymatoderma and Podoscypha are placed in the Polyporales.
Cymatoderma was found to be polyphyletic, with Cymatoderma sensu stricto distinct from other species nested with Podoscypha.

Conclusions:

The study refines the classification of stipitate stereoid fungi, necessitating revisions in existing taxonomic frameworks.
The placement of Stereopsis vitellina in Atheliales expands the known diversity within this order.
The polyphyletic nature of Cymatoderma highlights the need for re-evaluation of its species composition and generic boundaries.