A hybrid Agaricus bisporus strain of mushroom obtained by crossing a mushroom of the wild strain AA-0096 with the intermediate crossing strain of Agaricus bisporus 4x29, where a representative culture of said strain 4x29 is deposited with the ATCC Registration No. PTA-6877, and wherein a representative culture of said wild strain AA-0096 has been deposited with ATCC Registration No. PTA-6903, and wherein said hybrid mushroom strain (a) has at least one RAPD, SCAR or RFLP band of the wild strain AA-0096 that is not present in said intermediate crossing strain of Agaricus bisporus； (b) has at least one RAPD, SCAR or RFLP band of said intermediate crossing strain of Agaricus bisporus that is not present in the wild strain AA-0096； (c) has at least one physical characteristic selected from the group consisting of: hat color darker than a hat from the commercial brown Amycel 2400 strain, hat thickness that is thicker than a hat from the commercial brown amcel 2400 strain and increased productivity compared to the commercial brown strain Amycel 2400； and (d) it is genetically not compatible with the comparison brown commercial strain Amycel 2400.Una cepa de champiñón Agaricus bisporus híbrida obtenida cruzando un champiñón de la cepa silvestre AA-0096 con la cepa de cruce intermedia de Agaricus bisporus 4x29, en donde un cultivo representativo de dicha cepa 4x29 está depositado con el N.º de Registro de la ATCC PTA-6877, y en donde un cultivo representativo de dicha cepa silvestre AA-0096 se ha depositado con el N.º de Registro de la ATCC PTA-6903, y en donde dicha cepa de champiñón hibrida (a) tiene por lo menos una banda de RAPD, SCAR o RFLP de la cepa silvestre AA-0096 que no está presente en dicha cepa de cruce intermedia de Agaricus bisporus； (b) tiene por lo menos una banda de RAPD, SCAR o RFLP de dicha cepa de cruce intermedia de Agaricus bisporus que no está presente en la cepa silvestre AA-0096； (c) tiene por lo menos una característica física seleccionada del gr
