65 million years ago, immediately after the cretaceous-tertiary (k-t) extinction that famously killed off most dinosaurs, there is a dramatic increase in evidence of fungi, apparently the death of most plant and animal species leading to a huge fungal bloom like "a massive compost heap". the lack of k-t extinction in fungal evolution is also supported by molecular data, because phylogenetic comparative analyses of a tree consist of 5,284 mushroom species (agaricomycetes) didn't show signal for a mass extinction event around the cretaceous-tertiary boundary.