What caused this discoloration?

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Boxelder for sure. I read somewhere that the color is caused by a disease or fungus of some sort. Never really cared to research it further as boxelder is a weed tree that grows everywhere around here. Not terrible firewood but not great either. It's of the maple family and comparable to any other soft maple wood.
 
Boxelder for sure. I read somewhere that the color is caused by a disease or fungus of some sort. Never really cared to research it further as boxelder is a weed tree that grows everywhere around here. Not terrible firewood but not great either. It's of the maple family and comparable to any other soft maple wood.

That's a typical reaction to injury and stress in Box elder and some oak species. There are many causes but generally it's the same mechanism that causes burs.
Generally speaking Box elder injured wood has a more vivid red while Oak wood has a darker shade, almost wine-like.
 
That's a typical reaction to injury and stress in Box elder and some oak species. There are many causes but generally it's the same mechanism that causes burs.
Generally speaking Box elder injured wood has a more vivid red while Oak wood has a darker shade, almost wine-like.
+1 box elder. Had one in my yard I took down several years ago.
 

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