Can You Help Me Identify This Garden Problem?

Can you help a fellow gardener out? Luann and Tony have been following the high brix garden method for several years and have never seen anything like this. Have you? Unidentified growths on mulch, watermelon, cucumbers, parley and even some weeds look like it came out of a space alien movie.

Any thoughts or suggestions would be appreciated as comments below. Click on the pictures below to enlarge.