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A phylogenetic reconstruction and emendation of Agaricus section Duploannulatae

     Horticulture Research International, Wellesbourne, Warwickshire, CV35 9EF, UK

Richard W. Kerrigan ²

     Sylvan Research, 198 Nolte Drive, Kittanning, Pennsylvania, USA 16201

Philippe Callac ³

     INRA, Unité de Recherches sur les Champignons, 33883 Villenave d'Ornon cedex, France

Agaricus section Duploannulatae comprises the group of species allied with A. bisporus and A. bitorquis. Disagreement exists in the literature regarding the composition of this group. We used DNA sequence data from the ITS segments of the nuclear ribosomal DNA region, in a sample of European and North American isolates, to identify characters shared by this group, to further delimit species-level taxa within the section, and to develop a phylogenetic hypothesis. Shared polymorphisms that suggest a natural limit for section Duploannulatae were found. ITS1 data were assessed using parsimony, distance and maximum likelihood methods of phylogeny. The section Duploannulatae comprised six robust clades. Five clades corresponded to well characterized species from the temperate Northern Hemisphere (A. bisporus, A. subfloccosus, A. bitorquis, A. vaporarius, A. cupressicola). The sixth clade encompassed an A. devoniensis complex. Species concepts, nomenclature, and relationships are discussed and compared with prior reports.

Key words: Agaricus, cultivated mushroom, champignon, phylogeny, systematics

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