At least I think this is a great discovery. I managed to catch this slime mold in what seems to be multiple stages of growth. The first photo was taken a couple of days before the others. When I returned to the stump after a good soaking rain I found the blob had grown considerably and was displaying all it’s charms.

To the best of my knowledge this slime mold is:

Ceratiomyxa fruticulosa var. porioides

There’s not much information out on the web but my photos of it’s brain structure looks just like others that have been identified. (Correctly or not as the case may be)

What I think is the first stage looks like something that runs out of a toddler’s nose during winter. A clear snot like ooze had engulfed the surrounding moss. It appears to thicken and turn white as it ages.

The white stuff thickens even more turning yellow and looks like Witch’s Butter – Tremella mesenterica at this stage. But don’t let the photo fool you, this slime is not a tasty jelly mushroom.

I can only guess this is the mature stage and what looks like a brain coral is the spore bearing structure.

Compare the first photo with this one and you can see how the blob has grown. Check out the lower left part of the twig.

The last image is linked to a larger size (1024 x 768) and you can use it as a desktop background to remind you of your favorite wiseacre.
Nudge Nudge, Wink Wink