Bondarzewia berkeleyi (Berkeley's polypore)
Europe, North America, Africa, Asia
Fruiting Body 25-40 cm across
This site contains no information about the edibility or toxicity of mushrooms.
Bondarzewia berkeleyi, commonly known as Berkeley's polypore, or Stump blossoms, is a species of polypore fungus in the family Russulaceae. It is a parasitic species that causes butt rot in oaks and other hardwood trees.

Fruiting body consists of one to several spiraling caps arising from a single, gnarled stem-like structure. The individual caps are either kidney-shaped or irregular in outline, and can be loosely convex, flat, or have a central depression. They are dry and can have a velvety or leathery texture, sometimes with radially wrinkled or vague, semi-concentric zones of texture or colour. The caps are various shades of white to pale grey, cream, beige or yellow and turn sometimes brownish when mature. The pore surface is white, and the outer edges are tender and can be easily cut with a knife. Spore print white.

Microscopic Features: The spores measure 6-7.5 µm and lack ornamentation. They have a globose to subglobose shape. The spores are adorned with densely packed, amyloid, blunt-tipped spines that are approximately 1-2 µm long.

Bondarzewia berkeleyi on the MushroomExpert.Com Web site.

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