Marasmius siccus, or orange pinwheel,[1] is a small orange mushroom in the Marasmius genus, with a "beach umbrella"-shaped cap.

The tough shiny bare stem is pale at the top but reddish brown below, and the gills are whitish.

The distinctive cheilocystidia are broadly club-shaped with finger-like protrusions at the far end.

[4][5] This mushroom is found in hardwood forests from the Rocky Mountains to the Appalachian Mountains[6] and also in northern Europe and Asia.

[4][5] Although nonpoisonous, they are too small to be considered worthwhile as food.