The green stainer (Chlorociboria aeruginascens) is a mushroom that is not often seen, but evidence of its workings are left by a blue-green stain on the wood that it is decomposing. The plentiful rains this summer have allowed for many lesser seen fungi to fruit. This one is no exception. It is a gorgeous little cup fungus.
Cora Mollen, author of Fascinating Fungi of the Northwoods and founder of Northstate Mycological Club.