An Agaricus bisporus culture designated as Agaricus bisporus line J10102- s69, a representative culture of the line having been deposited under NRRL Accession No. 50893 is provided. F1 hybrid cultures may be derived or descended from this line by mating line J10102-s69 with another different Agaricus bisporus line, such as OWNC, wherein a culture of a new F1 hybrid strain is produced, such as strain J11500, wherein a representative culture of the strain has been deposited under NRRL Accession No. 50895. Those lines and strains derived or descended from these lines or strains, and/or EDVs of these lines or strains are also described.