Spotting

moved to fungi category

auntnance123, I am not sure if that lichen, because there is no algae or other plants that grow around the fungus. please, cmiiw.

So, this is a lichen (i.e. neither plant, fungus, or the other)?

Hi Chief RedEarth, this fungi shape is thin and curved semi-circle, which is why it looks like there are cut off. :)

Thank you Chief RedEarth. :)
Btw, sorry Chief RedEarth, can do you explain the purpose of the "cross section"? I can't understand.