Honeycombing

Honeycombing is internal cracking along a board's wood rays, caused by the same over-aggressive kiln-drying that produces case hardening, but honeycombing happens deeper in the board and often shows no exterior sign at all. The checks open up inside the wood, invisible until the board is resawn, planed down, or cut into and the internal cracks are suddenly exposed.

There's no reliable way to catch honeycombing before cutting into a board -- it's one of the real risks of buying kiln-dried lumber from a source that doesn't dry carefully, and a good argument for buying from a supplier with a track record rather than the cheapest kiln-dried stock available.