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<i>Agaricus macrochlamys</i>, a New Species from the (Sub)tropical Cloud Forests of North America and the Caribbean, and <i>Agaricus fiardii</i>, a New Synonym of <i>Agaricus subrufescens</i>.

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Isolation, Characterization, and Total DNA Extraction to Identify Endophytic Fungi in Mycoheterotrophic Plants

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Lectotypification of Agaricus brunnescens.

Richard W Kerrigan¹

¹Sylvan Research, 198 Nolte Drive, Kittanning, Pennsylvania 16201, USA. rwk@sylvaninc.com

|March 13, 2008

Summary

Agaricus brunnescens Peck is a heterogeneous type, containing DNA from both Agaricus bisporus and Agaricus subrufescens. A lectotype for A. brunnescens is designated, clarifying the taxonomy of the button mushroom.

Area of Science:

Mycology
Plant Science
Taxonomy

Background:

Agaricus brunnescens Peck is often synonymized with Agaricus bisporus (J. E. Lange) Imbach, the widely cultivated button mushroom.
This taxonomic relationship has faced historical debate and lacks universal acceptance.

Purpose of the Study:

To investigate the taxonomic status of Agaricus brunnescens Peck.
To resolve nomenclatural ambiguities surrounding the button mushroom's identity.
To clarify the relationship between A. brunnescens, A. bisporus, and A. subrufescens.

Main Methods:

Analysis of the type description and historical correspondence for A. brunnescens.
DNA sequence analysis of material within the type specimen.
Nomenclatural review and lectotype designation.

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Main Results:

The type specimen of A. brunnescens was confirmed as heterogeneous.
DNA sequencing revealed the presence of genetic material corresponding to both A. bisporus and A. subrufescens.
A lectotype was designated, aligning with the concept of A. bisporus.

Conclusions:

The heterogeneity of the A. brunnescens type necessitates a formal lectotypification.
This study clarifies the nomenclature and taxonomic history of A. brunnescens.
The findings contribute to a more accurate understanding of cultivated Agaricus species.