Canker Rot of Oak grows on trees inside of the bark. As the fungus grows, it pushes on the bark, causing it to break off of the tree. This accounts for all of the splinters obvious in many of these photos. In early stages, the spores of the fungus are a bright yellow, but as they age they turn brown and can even turn black--giving the appearance of a burned area.
The body of this fungus--called a basidiocarp--is where the spores are formed. The basidiocarp is made up of many tiny tubes.
Recently cracked bark.
The yellow spores coat every surface, including the webs spiders have left.
The spores can build up and look almost crystallized.
This is the inside surface of a piece of bark that is covered with spores. One section of the spores is wet, probably due to recent rains. The water plus the spores made a kind of 'paint'.
The spores on the bottom half of this photo are some that have gotten wet.
Some of the spore 'paint' that dripped down onto plants below the tree.