Thin-Walled Maze Polypore

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Thin-Walled Maze Polypore is a common, widespread, bracket fungus. It is found alone or in groups on logs and stumps of dead hardwood trees (saprobic). It is rarely found on oaks or conifers, and rarely found on wounds of live trees.

The fruiting body is a medium-sized, unstalked bracket. The bracket is fan-shaped or nearly round, and broadly convex or flat. It can be 2″ to 8½″ in diameter, but is usually no more than 6″ in diameter. It is leathery and flexible or corky when fresh, becoming rigid and inflexible when dry. The upper surface is dry and hairless or slightly hairy. It is reddish-brown or grayish and usually concentrically zoned. The margin is thin and sharply angled.

The pores on the underside are white to tan or brown, thin-walled, and variable in shape. They bruise pink or reddish when young. They are usually elongated, maze-like, 1 ⁄64″ to 1 ⁄16″ wide, and up to ⅝″ deep. Sometimes they are almost round; sometimes almost gill-like; sometimes, in older specimens, almost tooth-like.

The flesh is white to pinkish or brownish and tough.

The spore print is white.

Oak Mazegill (Daedalea quercina) is larger. The pore walls are thicker. The flesh does not bruise pink. It occurs on oak.

Dead deciduous trees, especially willow and birch; rarely on oak or conifers; rarely on wounds of live trees.

Present year round but fruits from June to December

Sources

4, 7, 24, 26, 29, 30, 77.

Common and widespread

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Westwood Hills Nature Center, St. Louis Park, MN (St. Louis Park, MN)

Location: Cass County