Fungus

My neighbor has a question for the group.  Two years ago her neighbor cut down a Calodendrum capense leaving the stump which is now covered with flat topped light tan mushrooms. Above the ground in various places along the root runs there are groups of white round topped mushrooms.  At a place where the round topped white mushrooms are happy a Buff Beauty rose on it's own root was planted 2 years ago so it's still pretty fragile.  It has suddenly died.  Is it likely that the fungus caused the death of the rose?  Both neighbors are concerned as they both have other roses in this area.
 
Your comments would be greatly appreciated.
 
Janet Ter Veen
Sunset Zone 24
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