Marasmius plicatulus

Marasmius plicatulus, also known as the red pinwheel or pleated marasmius, is a species of fungus. According to the Fungi of California website, "This handsome Marasmius is recognized by its velvety mahogany cap, slender stature, widely spaced pallid to pinkish gills, and shiny, thin, wiry stipe." The red pinwheel is often found in association with oak trees or conifers, and flushes most commonly during the winter months of November to January. Of the Marasmius species found on the Pacific coast of North America, the pleated is physically the largest. The red pinwheel appears to be predominantly known from western/coastal North America, although it has been observed as far inland as Idaho.