Marasmius oreades, also known as Fairy Ring Marasmius, is a small agaric which is producing characteristic rings in lawns. It has a bell-shaped to convex cap, which becomes flatter with a broad umbo with age. The mushroom belongs to the family Marasmiaceae which contains about 500 species of agarics, of which a few, such as Marasmius oreades, are edible.
at first convex, then flat to cup-shaped with a low central hump that is often a darker shade. Colour varies from light beige to brown yellow. The margins are usually crinkled and almost transparent and streaky in damp weather. They turn lighter in dry weather and regain their colour in more humid conditions. The flesh is whitish buff, thick at the center, otherwise thin. Gills
free, sparse, and convex in the center with horizontal ridges. Creamy white at first, becoming ochraceous cream, fairly broad and distant. Spores
tall, coloured as the cap, smooth or finely scurfy, slender, more or less equal, whitish downy at the base and slightly rooting, stiff. The mushroom has no ring.
include the poisonous Clitocybe dealbata which is found in the same grassy habitat. It is distinguished by its decurrent gills. Another one is the very poisonous mushroom Clitocybe rivulosa and the inedible Agrocybe pediades
. Similar species also include other species in the Marasmius genus, like Marasmius vagus.
on the First Nature Web site.
on the mykoweb.com Web site.
on the MushroomExpert.Com Web site.