This is what Bob found!

Horned Fungus Beetles (Boliotherus cornutus) dining happily on Ganoderma applanatum

Photo: Bob Hall, University of Guelph

Once the bracket is disturbed, however, the insects make a hasty exit. 

This is where we got the expression 'beetling off'!

Thanks to Steve Marshall, Uof Guelph for identifying the insect

Note:  For more on horned fungus beetle check the following URL

http://www.fcps.k12.va.us/StratfordLandingES/Ecology/mpages/horned_fungus_beetle.htm