Calvatia gigantea
                      Calvatia gigantea
The giant puffball pictured here is the size of a basketball; found early October
(2005) in semi-open woods.  These mushrooms produce trillions of spores.

Can be found October and into early November, often after heavy rains.
See Calvatia gigantea at
MushroomExpert.Com
Calvatia gigantea
INDIANA MUSHROOMS
Calvatia gigantea
Calvatia gigantea
Calvatia gigantea
Calvatia gigantea
This pristine specimen of Calvatia gigantea was also found early
October (2008) growing in semi-open woods (mixed hardwoods) with
walnut trees present.  Soccer ball sized.  
Calvatia gigantea
Calvatia gigantea
These mature, spore-filled examples of Calvatia gigantea were found in
spring
, having over-wintered and still dispersing spores.
Calvatia gigantea
Calvatia gigantea
Calvatia gigantea
These giant puffballs were among a grouping of ten found in early November
growing in semi-open woods (mixed hardwoods) with walnut trees present.
Point of attachment to the ground is often only a web of mycelia emerging
from the soil.
Calvatia gigantea
Calvatia gigantea
Calvatia gigantea
Calvatia gigantea
Calvatia gigantea