List environmental issues that need to be considered when working in the vicinity or treatment of bracket fungi. Identify what recording, reporting and monitoring procedures are required for bracket fungi. What disposal methods are required for infected plant or material?
This article should be of some help to you: https://www.gardeningknowhow.com/ornamental/fungus-lichen/tree-bracket-fungus.htm
There is a growth I think called Bracket Fungus on a the trunk of a Sycamore tree. Is this fungus poisonous to humans?
Some old herbals list bracket fungi as useful in treating certain diseases; however, more modern sources list them as poisonous. Be that as it may, they are certainly not edible. But if you mean, can you be poisoned by handling or brushing agains one, I wouldn't think so. Gloves are recommended if you're planning to mess with one, however. Here's some more information: https://www.gardeningknowhow.com/ornamental/fungus-lichen/tree-bracket-fungus.htm
Are there better places to locate shelf fungus (i.e. swampy area or dry)? If there is a tree with fungus, is it likely that more would be near. Is there any special handling procedures?
Bracket Fungus or shelf fungus does prefer to attach to host trees in a damp environment.
Here is a link about Bracket Fungus.
Husband knocked it off of tree and now has a lump underneath his skin where it touched.
There should not be any issues touching or handling Shelf Fungus.
We use a a large dead eucalyptus stump as a seating area. How can I kill the fungus that continues to grow, and how do I seal the the wood?
Well, this is interesting, and unfortunate! While the species Leatiporus is regarded as edible... It will not be from this wood. It is not safe to consume fungi growing from this wood source.
At this point, seeing a mature fruiting body, the wood will not be able to be saved. The mycelium is well within the wood, causing a brown rot. This will cause the wood to crumble, eventually.
You will be looking at replacing this wood, unfortunately.
Should you decide to take a culture or spores and make an attempt at growing them, you can switch the culture to a different wood source, such as Oak fuel pellets. They will, then, be safe for consumption. Just not on the current wood source. That is no good. Otherwise, when growing in the proper substrate, these make a wonderful chicken substitute. Please do not eat them from Eucalyptus wood, though.