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

Abstract

Agaricus is a genus of fungi in the family Agaricaceae, with several highly priced edible and medicinal species. Here we describe Agaricus macrochlamys, a new species, in A. sect. Arvenses, sympatric and morphologically cryptic with the edible and medicinally cultivated mushroom, A. subrufescens. Phylogenetic analyses showed that A. macrochlamys is closely related to A. subrufescens, and that A. fiardii is a new synonym of A. subrufescens. Despite being morphologically cryptic, A. macrochlamys can be distinguished from A. subrufescens by several ITS and tef1α species-specific markers and a 4-bp insertion in the tef1α sequence. Furthermore, A. subrufescens is a cosmopolitan species, while A. macrochlamys distribution is so far restricted to Mexico, the Dominican Republic, and the United States.

Six New Species of Agaricus (Agaricaceae, Agaricales) from Northeast China

“…However, the study of Parra showed that A. fissuratus is an independent species [17]. Cao et al [25] and Medel-Ortiz et al [18] accepted this view. This study agrees with Parra's view.…”

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“…In Mexico, 55 species of Agaricus belonging to six subgenera and 10 sections are known (Chen et al 2020, Palestina-Villa et al 2020, Medel-Ortiz et al 2022, however, only 10 taxa have been studied both morphologically and molecularly. From material collected in Mexico, the novel species A. guzmanii Linda J.…”

“…Chen & G. Mata (2019:95), A. macrochlamys Medel, Garibay-Orijel, Argüelles-Moyao, G. Mata, Kerrigan, Bessette, Geml, Angelini, L.A. Parra & Linda J. Chen (2022:16), A. tlaxcalensis Callac & G. Mata (2008:881) and A. tollocanensis Callac & G. Mata (2004:31) have been described to date (Callac & Mata 2004, Kerrigan et al 2008, Chen et al 2019, Medel-Ortiz et al 2022.…”