Dog vomit on the streets of Boston

At first, I thought the Urban Pantheist was really stretching it in his effort to chronicle 365 wildlife species that can be found in Boston, with a post titled Dog vomit.

Turns out that's the name of a species of slime mold that looks like, well, indeed:

... The most disgusting but unassailably accurate common name I've ever heard for any organism is "dog vomit" slime mold. A foamy pile of goo, yellowish like bile, or pinkish like stomach contents, no name fits quite like dog vomit. Sometimes it is called "scrambled egg" slime mold, but where's the fun in that? ...

Complete with photos showing the development of one of them:

The plasmodium surges slowly forward, consuming organic matter, and then gathers itself up to form an aethalium.