INDIANA MUSHROOMS
     Hypomyces luteovirens
Normally, the gills and stem of this Russula mushroom are white,
but this collection has been attacked by the parasitic fungus

Hypomyces luteovirens
.
This microscope image shows the perithecia (tiny fruiting bodies)
of
Hypomyces luteovirens that contain the spore producing cells.
See Hypomyces luteovirens at
MushroomExpert.Com

Hypomyces
Penn State & USDA