#1 You can see the white sapwood. Take note that the width of the sapwood in the longitudinal plane is consistent with the inner heartwood.
#2 and #3 You can see the color altered wood (formally known as discolored wood) within the heartwood, which is from a wound or injury. You can have color altered wood in heartwood. The color altered wood will decay first. The color altered wood is a protection wood just as the heartwood is a protection wood. Heartwood color is from an aging process. The color altered wood is from a wound or injury.
#3 Has decayed. You can see the decay does not extend into the sapwood or symplast. Microorganisms do not move freely in trees. They respect boundaries often.
Image source (SHIGO, 2002)
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