Mace comes from nutmeg. The lacy aril is removed by hand from the outer shell of the nutmeg and then dried, becoming yellowish-brown mace. Mace is sold in whole pieces called blades or in the more commonly-found ground form.
The color can often help you determine its origin. Orange-yellow blades most likely come from Grenada, while orange-red blades tend to be from Indonesia. Mace has a flavor described as a combination of cinnamon and pepper, a more pungent version of nutmeg.
Nutmeg may be substituted for mace in a pinch and vice versa, but obviously the end result will be affected as with any substitution.
Mace, spice consisting of the dried aril, or lacy covering, of the nutmeg fruit of Myristica fragrans, a tropical evergreen tree. Mace has a slightly warm taste and a fragrance similar to that of nutmeg. It is used to flavour bakery, meat, and fish dishes; to flavour sauces and vegetables; and in preserving and pickling.