Taproots develop from the radicle of a seed, forming the primary root. During germination, the seedling's radicle emerges through the micropyle. If the radicle begins to decay, the seedling undergoes preemergence damping-off. Its root develops from the radicle and is brownish white. Above the radicle is the embryonic stem or hypocotyl, supporting the cotyledon(s). Hypophysis later gives rise to the radicle and root cap. The first root that comes from a plant is called the radicle. The primary root from the radicle may then fail to develop further. The radicle emerges from a seed through the micropyle. The hypophysis will later give rise to the radicle and the root cap. Here the hypocotyl is a rudimentary axis between radicle and plumule. This disease appears on the radicle as darkened spots. Cotyledons often large, radicle terete.