Postia caesia
This polypore mushroom exhibits blue-gray color tones, has a soft and
spongy consistancy, a fuzzy cap surface and grows on wood.  Mature
examples (pictured above; 8cm) develop a sharp cap margin and a gray
to blue-gray pore surface.
Oligoporus caesius is a synonym.
See Oligoporus caesius at
Fungi growing on Wood
Very young examples (2cm) of Postia caesia and its habit of
formation along the side of a hardwood log, possibily sycamore.
Postia caesia often grows in over-lapping groups,
but single specimens may also be found.
The blue-gray spore deposit and sausage shaped spores (4-5 x 0.7-1µ)
of
Postia caesia.