Invasion of the Mushrooms ... during the pumpkin season

It's mushroom time again in Houston. They are all around us, often in large circles on open grassland and lawns. Must be the right climate again, but by no means does it only happen a certain time out of the year. Here is a take of the current crop:

Mushrooms on green adjoining Memorial Loop Trail (Terry Hershey Park/Trail) East of Langham Creek
near the bat houses on stilts