Coming soon to a wood near you?

Down in the woods today I found many dead branches glowing neon orange with clusters of these tiny 'bats' (it's the underside that has the honeycomb structure, the upper surface is smooth.)

Favolascha calocera  is a new kid on our fungal block but is creeping north from its original British landfall in Cornwall or Devon in 2012. I blipped them in 2020 when they reached West Wales. 
 https://www.blipfoto.com/entry/2748618723949544084

The species seems to have originated in Madagascar but has  spread worldwide via the timber trade first to Australasia and New Zealand  then to Europe and North America. There's concern that it may outcompete native species of fungi where it takes hold.  However, global heating along with  international trade and travel  makes it  likely that orange ping pong bats are here to stay.

I noticed that that they seem especially fond of dead sycamore twigs and branches that have fallen to the ground. Sycamore is not a native of the British Isles either but thought to have been introduced by the Romans - or the Tudors (maybe both!) Although well established in the countryside the sycamore not a popular tree for a number of reasons (honeydew, prolific seedlings, heavy shade, poisonous to horses). But it's a source of food to some wild creatures as my extra suggests. I suspect that it was a squirrel that neatly extracted the seeds from the winged pods (aka samaras). 
Grey squirrels too were immigrants once...

(Full disclosure:  I'm only 25% of British descent myself)