Glowcaps are glowing mushrooms added by the Wild Caves 3 mod. They emit fair amounts of light and come in four sizes; small, medium, normal and large, which is as big as a player. They drop small amounts of glowstone when harvested.
Glowcap Mushroom
Variants
(Please add details if there is another glowcap color.)
Glowcaps come in 2 different colors, green, by default, which is in most caves, and blue, which is only found in ice caves.