Lycopodium spore powder is a fine yellow powder derived from the spores of Lycopodium clavatum (stag's horn club moss, running ground pine). When a lighted match is dropped into a pile of this powder, it does not burn. However, when the powder is dispersed into a fine mist near a candle flame, it ignites into a spectacular fireball. This results from an increase the available surface area for combustion: when the powder is dispersed into a mist, the particles are surrounded by enough oxygen to support a combustion reaction.