Oligoporus caesius (Schrad.: Fr.) Gilbertson & Ryv., syn. Tyromyces caesius (Schrad. ex Fr.) Burr. Bracket 1-8cm across, 1-4cm wide, 0.3-1 cm thick, convex to flat, semicircular, with a sharp margin; upper surface whitish, becoming blue-gray with age or hardening; covered in fine long hairs. Tubes 2-8mm deep; White, later gray-blue. Pores 2-4 per mm, circular or angular to elongated; white, becoming grayish or gray-blue with age. No stem. Flesh soft, spongy, watery when fresh; white, gray or yellowish in age. Odor often fragrant. Taste soapy. Spores sausage-shaped, mouth, amyloid, 4-5 x 0.7-1µ. Deposit pale blue or whitish with a gray-blue tinge. Habitat singly or in overlapping groups on dead wood. Frequent. Found in Europe and throughout North America. Season August-November. Not edible.