Like it says in the title, I haven't seen any ranged attacks, spells, or friendly monster kills result in sporeification. Is fungal arts now a melee-character only skill?
It shouldn't be. It's a targetKillBuff, which triggers on any death you cause with an action (i.e. not caused by pets or traps), just like Blood Mana does.
Has happened for me with crossbow shots and thrown projectiles - not flasks or 'nades though, it seems. Went through most of a big fat zoo with brimstone flasks and thermite bombs and don't recall seeing any sporification/fungling, or damage procs from Battle Mycology.