Minecraft wiki entry for Huge_fungus, associated text: The trunks of huge fungi are made of either warped stems or crimson stems depending on the type. Huge fungus trunks can be either thick or thin: thick trunks grow up in a 3×3-plus shape, with stray stems sometimes in the corners, while thin trunks grow straight up as a 1×1 column. To determine the size of huge fungi, a random integer is chosen between 4 and 13 [inclusive]. There is then a 1⁄12 chance of that integer doubling. The resulting value is the height of the trunk. A layer of wart blocks and shroomlights is then spread around the trunk, being able to generate up to 3 blocks out from the trunk. There is a 3×3×2 hollow ring that surrounds the lowest block of a fungus where no blocks generate. Both variants have shroomlights generate inside them, both replacing the wart blocks and stems. Huge crimson fungi may also have weeping vines growing replacing the same, or from the underside of wart blocks. In this way huge crimson fungi may grow the weeping vines lower than the stems as well as initially generate replacing the stems, when naturally-generated uniquely along the local ceiling.