Debra Chase of Lebanon examines a reishi mushroom, known for medicinal uses such as boosting the immune system, growing on an old tree along the Perimeter Trail during a mushroom foraging walk led by the Great Works Regional Land Trust at Negutaquet Conservation Area in North Berwick.

Little brown mushrooms, also known as LBM's, grow on the forest floor at Negutaquet Conservation Area.

A poisonous puffball mushroom growing on a mossy log.

Philippa Stratton of Cape Neddick inhales the scent of an organic oyster mushroom provided by Mousam Valley Mushrooms in Springvale.

The foraging walk educated participants about edible mushrooms and where to find them.

Norma Lamb, left, of Kennebunkport, and Jennie Lord, right, of Moody watch as Allyn Lamb photographs a turkey tail mushroom.

Emily Sharood of Mousam Valley Mushrooms in Springvale carries a basket of tools for mushroom foraging. Emily and her family were invited on the walk to share their knowledge of mushrooms.

Bright yellow "Chicken of the Woods" mushrooms, named because they are edible and taste like chicken, grow high atop an old tree at Negutaquet Conservation Area.

Andrew Proulx of Wells takes a closer look at birch polypore mushrooms, known for their medicinal qualities.

A group of about 25 people hiked the Perimeter Trail at Negutaquet Conservation Area in North Berwick in search of mushrooms.