Yes, yes of course! The Edmundium is the cause! If there are truly molten pools of Edmundium somewhere in these caverns, then Edmundium minerals would have spread throughout the soil over time, allowing its wondrous properties to affect nearby flora and fauna.
Even if it is not the direct source of the charge found in this forest's bioluminescent wildlife, it may have incited incremental changes in those species over several generations, which then led to their development of an internal charge.
How invigorating! I could be standing in the middle of an entire ecosystem that has been absorbing the effects of Edmundium for generations, and all of its secrets are mine for the taking. Magnificent!