The slime mold was spotted on a spruce tree in Alaska’s Glacier Bay National Park and Preserve, officials said in the caption of a video posted to Facebook on July 7.

For a sense of scale, this patch of slime mold surrounding and covering lichen and spruce bark was about 3 x 4 inches. The entire slime mold was about 10 x 5 inches in a rectangular blob shape ...

The slime mold was spotted on a spruce tree in Alaska’s Glacier Bay National Park and Preserve, officials said in the caption of a video posted to Facebook on July 7.