P1010040

P1010040

Observation - P1010040 - UK and Ireland. Description: I had a number of timber boards stacked vertically against a wall. As I started to move them, I found they appeared to be firmly stuck together, and it was quite difficult to prise them apart. The glue was patches of cocoons? similar to those in the t

I had a number of timber boards stacked vertically against a wall. As I started to move them, I found they appeared to be firmly stuck together, and it was quite difficult to prise them apart. The "glue" was patches of "cocoons"? similar to those in the top of the picture. On closer examination, many of the contained a small yellow lava at the end.
I would just love to know what they are.