Are there any documented cases of extinction of a species of fungus? I imagine it would be hard to detect something like this.
Edit: documented by humans when it happened and/or induced by humans.
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According to the International Union for Conservation of Nature’s Red List there are many endangered fungi, but none that are documented to have become extinct within the time frame you are interested in.
However, it seems likely that some fungi are have gone extinct with their plant hosts — according to the IUCN there are 133 plant species known to have become extinct. Supporting this is the prevalence of mycorrhizal1 (and other) associations between plants and fungi and that some of these associations appear to be specific (i.e. the fungus only associates with one plant species). For example, there are reported to be 28 species of fungi that only associate with the shrub Lantana camara2.
1: Hoeksema, J. D., Bever, J. D., Chakraborty, S., Chaudhary, V. B., Gardes, M., Gehring, C. A., ... & Lajeunesse, M. J. (2018). Evolutionary history of plant hosts and fungal symbionts predicts the strength of mycorrhizal mutualism. Communications biology, 1(1), 116.
Yes. One example is of a fungus named Prototaxites. It was originally thought to be a tree, but it was a massive, tree-like fungus.