I suspect a large number of Australian fern species, especially those with elevated situations (epiphytes) such as Asplenium (colloquially "Birds Nest Ferns") and Platycerium ("Staghorns" and "Elkhorns") as well as those with substantial frond sizes Todea barbara ("King Fern") or Pteridium esculentum ("Bracken Fern") or tree-like stature Cyathea/Dicksonia ("Tree Ferns") may have evolved partly to benefit from fire for spore release and long distance transmission due to fire-related updrafts. This could make sense because they may usually otherwise be 'trapped' in high moisture locations without due to an absence of strong updrafts facilitating ascending to higher altitudes yielding potential for longer distance transmission. Just as ferns are often the first greenery to emerge from winter landscapes in the northern hemisphere, ferns are often the first visible greenery to return to burned bushland... after moisture.
Based on their age I suspect a large number of fungi probably respond to fire, especially subterranean species that are likely subject to only partial thermal trauma.
Stepping back from fire to lightning, I similarly suspect "getting hit by lightning" and/or consequent canopy opening elicits a fungal response which also benefits trees that are victim to lightning strike.
A primary evolutionary purpose of the oils seems to be as a pathogen resistance measure, being antibacterial, antiviral, antifungal.