Friday puzzle revealed

And we have a winner!  As Karen guessed, these are lichens on decomposing granite:

This photo is from the Fortynine Palms oasis area in Joshua Tree National Monument.  These lichens (symbiotic amalgams of fungi and algae) could be decades or centuries old – they are very slow spreading. 

Most creative answer goes to TT, who thought it looked like sweet potato casserole!  The quartz does look like marshmallows.

One thought on “Friday puzzle revealed”

Leave a Reply