Embryo thick and fleshy, "with a large concealed cavity at the summit, the plumule curved in a groove on the outside."
They may also be divided into those with and without the plumule.
Plumage generally compact, the feathers with thick spongy shaft, and destitute of plumule.
When there is such a bud between the cotyledons in the seed or seedling it is called the plumule.
Embryo with a single cotyledon, and the leaves of the plumule alternate.
The plumule emerges at the upper end of the grain, and the embryo has 5-6 secondary roots.
The plumule consists of successive layers of rudimentary leaves, the outer enclosing the rest (Fig. 10, 1, c).
In the feathers of a large portion of birds there is a plumiform formation, or small feather or plumule.
It consists of one or more seed-leaves or cotyledons, a radicle or young root, and a plumule or young bud.
The sheath which envelopes the radicle is called coleorhiza and that of the plumule, pileole or germ-sheath.
The developing bud of a plant embryo, situated above the cotyledons and consisting of the epicotyl and immature leaves. See more at germination.