Look for Sulfur Tuft Mushrooms from April through to the first heavy frosts, a walk-in our island forests rarely fails to reveal Sulfur Tufts fruiting on fallen trees, decaying stumps, or hollow trunks of living trees. This wood-rotting fungus will happily feed on deciduous hardwoods as well as conifers with equal relish, although it is most effective in rotting hardwoods, which generally have a higher cellulose content and rather lower lignin content than conifers.
The caps of these mushrooms grow to a common size and this helps in identification. The Sulfur Tuft fungus, Hypholoma fasciculare, is classed as inedible, but even if you do try, the taste is so bitter that I doubt if you would continue to eat it. In some parts of the world, Hypholoma fasciculare has been linked to severe cases of poisoning and at least one death.
Poisoning by Hypholoma fasciculare is occasionally reported, and apparently, it can result in severe symptoms, including not only stomach pains and nausea but also temporary paralysis and distorted vision. If you suspect that someone has consumed them, the onset of effects will take between five and ten hours between the ingestion of these fungi and the appearance of symptoms of poisoning.