The study of ecological factor on growth of mushroom genus Phellinus spp. In Acacia auriculaefomis plantation at Donmuang District, Bangkok. Was conducted in April 2007 and October 2007 by collecting ecological parameters both quantitative and qualitative that assumed to be influent on growth of Phellinus spp.The study found 83 of mushrooms. The average size of mushrooms was increase (16.62 ± 28.77 cm2). The quantitative ecological parameters that most influent (R2 = 0.167, P