Dear me, I forgot to divulge the answer from my last "What is this?" post. It's the latest grossness that grows on a frame. You can see the little glob of glue that failed to hold this little fungi in place. Hot glue is crummy, crummy, crummy, but I knew that, and shouldn't have used it.
These little fungi are loosely based upon these... clickifyhere. So loosely in fact that I only knew about them after my sister Kim told me what they were, that's why she wasn't allowed to guess, I wasn't simply being mean. I'm sure I've seen them somewhere before, or some fungi like them somewhere in my life.
p.s. just found this... cup fungi... it matches much better.