There are several lichens on this stump. One of them

Cladonia deer (lat. Cladonia rangiferina) is a bushy lichen from the genus Cladonia. Due to the bushy, highly branched thallus, Cladonia deer is sometimes isolated in the genus Cladina.

Your drawing is very similar to a page from an old reference book, it turned out great. By the way, Cladonia is a very good model for the next page)))

In the last picture, Parmelia lichen is very good for immunity.