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Species of fungus

Agaricus subrufescens (syn. Agaricus blazei, Agaricus brasiliensis or Agaricus rufotegulis) is a species of mushroom, commonly known as almond mushroom, almond agaricus, mushroom of the sun, God's mushroom, mushroom of life, royal sun agaricus, jisongrong, or himematsutake (Chinese: 姬松茸, Japanese: 姫まつたけ, "princess matsutake"). A. subrufescens is edible, with a somewhat sweet taste and a fragrance of almonds.

Agaricus subrufescens was first described by the American botanist Charles Horton Peck in 1893. During the late nineteenth and early twentieth centuries, it was cultivated for the table in the eastern United States. It was discovered again in Brazil during the 1970s, and misidentified as Agaricus blazei Murrill, a species originally described from Florida. It was soon marketed for its purported medicinal properties under various names, including ABM (for Agaricus blazei Murrill), cogumelo do sol (mushroom of the sun), cogumelo de Deus (mushroom of God), cogumelo de vida (mushroom of life), himematsutake, royal sun agaricus, Mandelpilz, and almond mushroom. In 2002, Didukh and Wasser correctly rejected the name A. blazei for this species, but unfortunately called the Brazilian fungus A. brasiliensis, a name that had already been used for a different species, Agaricus brasiliensis Fr. (1830). Richard Kerrigan undertook genetic and interfertility testing on several fungal strains, The cap surface is covered with silk like fibers, although in maturity it develops small scales (squamulose). The color of the cap may range from white to grayish or dull reddish brown; the cap margin typically splits with age. The flesh of A. subrufescens is white, and has the taste of "green nuts", with the odor of almonds.

A. subrufescens forms fruit bodies singly or in clusters in leaf litter in rich soil, often in domestic habitats. Originally described from the northeastern U. S. and Canada, it has been found growing in California, Hawaii, Great Britain, the Netherlands, Taiwan, Philippines, Iran, Australia, Brazil,

Preliminary research indicates Agaricus products may have toxic effects on liver function marked by increased serum level of liver enzymes, especially in people with ovarian cancer, and may cause allergic reactions.

A. subrufescens is edible, with a somewhat sweet taste and an almond aroma resulting from benzaldehyde, benzyl alcohol, benzonitrile, and methyl benzoate. Used in traditional and alternative medicine for its supposed anti cancer effects, Agaricus mushrooms have not been assessed by sufficient high quality clinical research to define safety and biological properties upon consumption as a food, dietary supplement, or drug.