Agaricus species- Chethalayam, Wayanad, Kerala

Could someone assist me in identifying this mushroom please?
Date & Time        2 July 2010
Location: Place, Altitude, GPS        Chethalayam, Wayanad, kerala, India.
Habitat: Garden, Urban, Wild Type:        Wild
Plant Habit: Tree, Shrub, Climber, Herb        Mushroom
Some kind of Agaricus sp but tough to say with the immature basidiocarp!!
Is it Agaricus species ?
Agaricus moelleri Wasser ??

Again an Agaricus spp. (Immature)