The term 'small-capped mushroom' refers to the edible mushroom species known as Enoki (or Enokitake). This species is characterized by its long, thin stems and small, white caps. It is native to East Asia and is widely used in Japanese cuisine. Enoki mushrooms are also popular in other Asian cuisines, such as Chinese and Korean. They have a mild, slightly sweet flavor and can be eaten raw or cooked.