Cup shaped Turkeytail

It is interesting that mushrooms that normally grow as a shelf from the side of wood, will grow in a circular pattern when they find themselves on top of a log.  The Turkeytail on the left not only grew round but formed a water tight cup.  The one on right did not quite reach this stage.  You see the sun reflected from the water in the center. 

Below is the normal Turkeytail growing on the same log.