Note: Be careful of the spelling. It is not spelled callose and not spelled callous. See "Modern Arboriculture" page 147.
Callus has three characteristics.
1. Callus - cells are all the same size and shape.
2. Callus - has very little lignin.
3. Callus - is meristematic. What this means is that it can divide and differentiate to form any and all parts of a tree. It can form roots, it can form buds and it can form sprouts. =
Callus starts after a wound.
In many cases you will see what are called "sprouts from dormant buds" are actually sprouts from callus. If you look you will see they come out from the callus ring.
As the tissues become lignified,
as they begin to have different shapes,
as they no longer are meristematic,
That which was once called callus,
is no longer callus, and is, and should be, called, woundwood.
Dormant buds can form the second year on a sprout that has come from callus.
More on woundwood and callus.
More on this coming in the next reprint of MODERN ARBORICULTURE.
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John A. Keslick, Jr.