Union Fair for the first time is having a day full of mushrooms. The fair runs from Aug. 20-27 and during those days the fair’s exhibition hall next to the wine tasting pavilion will have exhibits, demonstrations, and talks focusing on small scale agriculture in Maine.

On Friday, Aug. 26 the focus will be mushrooms. Three presenters will offer tables of demonstrations and PowerPoint talks about mushrooms.

At 1 p.m. David Spahr will talk on edible and medicinal mushrooms. Spahr has written a popular book on the subject, “Edible and Medicinal Mushrooms of New England and Eastern Canada,” and has been featured on several television programs on the subject. Spahr lives in Washington and brings to the table 40 years experience foraging and collecting mushrooms.

At 3 p.m., Candice Heydon of Damariscotta, owner of Oyster Creek Mushroom Company, will have a presentation on growing mushrooms in Maine. She has had 20 years experience in growing and selling mushrooms along with a variety of mushrooms products. The company will have a table for demonstrations of interest to the budding mushroom grower.

At 5 p.m. the well known mushroom lecturer, Greg Marley of Rockland, will give a presentation on edible mushrooms, focusing on those available to some degree in most everyone’s backyard, but especially on the most common and flavorful “foolproof” mushrooms which he calls Maine’s Sumptuous Seven Easy Edible Mushrooms. His most recent book, “Chanterelle Dreams, Amanita Nightmares: The Love, Lore, and Mystique of Mushrooms,” will be on sale.

Fair attendees will be welcome to attend any or all of the presentations as well as browse the demonstrations of these mushroom professionals and ask them questions.