Polyporus arcularius is recognized by its brown cap color, its whitish pore surface, and its finely hairy cap margin.The cap is about ½ inch to 3 inches wide. It is convex to shallowly vase-shaped. It is dry; smooth or somewhat scaly; brown to golden brown, the colors frequently breaking up into rough concentric zones. The cap margin has hairs. The pore surface is white sometimes running down the stem. It has a brown stem that is about 1 to 2 1/2 inches long. It was identified by Dr. Tom Weber a mycologist at the Univ. of Nebraska at Omaha.
This polypore is found in the spring., It is seen on the dead wood of hardwoods; causing a uniform white rot. This photo was taken in Habitat Hollow and is the first photograph of one in Fontenelle Forest although it is probably on other trails also. It is found on various deciduous trees especially cottonwood.
Extracts from this mushroom have been found to have antibacterial and antitumor activity.
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