From Nature journal:
Mushrooms popping up year-round
UK fungi season now longer in autumn, with an extra fruiting in spring.
Climate change could turn the autumnal fungus foray in Britain into a year-round event, say researchers who have recorded changes in fruiting patterns over the past half-century.
In the autumn, the UK mushroom season has doubled in length, from about 33 days in the 1950s, to nearly 75 days now, they say.
Fungi are starting to fruit earlier, and finishing later.
And some species are fruiting in both spring and autumn — a unique development in response to rising temperatures, says Alan Gange of Royal Holloway, University of London.
Although it has been shown that climate change is making birds nest and flowers bloom earlier, he knows of nothing else that has added a complete extra breeding season to its life cycle.
Fungus-bacteria symbiosis: here.