Fusarium merismoides

From https://www.jungledragon.com/image/57588/slime_flux_-_fusicolla_merismoides.html, which uses the common name Slime Flux:

Slime flux begins as a bacterial infection. As the bacteria grows (in the roots of the tree), methane gas is produced, which causes pressure within the tree. The pressure forces the bacterial flux through any wounds in the tree. The flux is then quickly consumed by numerous different species of fungi - mostly types of yeast. Some of these types of yeast are pathogenic to humans. So, Fusicolla merismoides is actually a complex of species - a microbial consortium.