The Ambernac Poplar Incident: Luminescent Sphere and Fallen Tree

On October 31, 1983, at approximately 6:45 PM in Ambernac, Charente, France, a single witness was alerted by their dog's unusual barking and observed through a window an intense luminous sphere described as "large as a tractor wheel" moving slowly through thick fog despite nightfall. The light evolved slowly before disappearing rapidly behind a row of poplar trees situated along a river. The following morning, based on the witness's directional indications, investigators discovered a 25-meter tall poplar tree broken at a height of 8 meters, with the upper section found on the ground among wild vegetation. The break exhibited two distinct characteristics: a clean fracture extending to the center of the trunk, followed by a wood tear approximately 2 meters in length. GEIPAN conducted a thorough investigation including laboratory analysis of the tree remains. The analysis revealed that the tree had likely been attacked by fungi for an extended period, progressively degrading the interior without visible external modification. When degradation reached the middle of the tree, its equilibrium was compromised, allowing it to fall under minimal pressure. This deterioration was reinforced by prevailing winds causing general fatigue to the vegetation between 4-5 meters height, facilitating the appearance of destructive fungi. A brownish zone and cicatricial bark layer found at the rupture point were consistent with this hypothesis. Regarding the intense light observed, a consulted laboratory proposed that the tree trunk, colonized by luminescent organisms (bioluminescent fungi), could have exposed these organisms at the moment of rupture, producing significant luminescence for a certain period. This phenomenon, observable in nature where numerous species of luminescent organisms exist—including many fungi capable of emitting intense light sufficient to illuminate a room—could explain what the witness observed without being able to interpret it at the time.