The curious knobby rootstock, shaped like a bit of coral, gives the name to this strange and rather unwholesome looking plant. From living on decayed vegetation it has lost its green leaves, and has only a few papery sheaths in their place, and the thick, translucent stem is pale and smooth, from one to two feet tall, pink at the base, shading to golden-brown towards the top. The flowers, less than half an inch across, are usually yellow, with reddish-brown tips, and the white, three-lobed lip is spotted with purple. The buds are yellow and brown and the whole color effect is very pretty, as if the plant were trying to match the russet tints of the floor of the forest. The flowers vary from several to many and grow in a long cluster, hanging down when their seeds begin to ripen. This is widely distributed, growing also in the East, but nowhere common.