Wormy maple, Ambrosia maple

Scientific name:  Not a distinct species of maple; describes a fungal discoloration caused by wood-boring ambrosia beetles. The majority of ambrosia maple is found in species of soft maple.

Description:  So named for ambrosia fungi, which is found in association with ambrosia beetles. The beetles bore into the trunk of the tree, bringing with them the ambrosia fungi, which subsequently stains and discolors the surrounding wood. The discoloration can be very similar to spalted maple, though with ambrosia maple, the discoloration is centered at the boring paths of the beetles, and their entrance holes can usually be seen