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ah, ah. You're presuming 'fire' without 'fire damage', then presuming 'cold' without pointing out 'cold damage'.
I.e. the fire gets close enough to do fire damage, it doubles. General warmth will also slowly increase it in size...it feeds on heat. And yes, being in the sun can do heat damage, and yes, fire resistance does stop it. By your reckoning, if it's not actual fire, it can't do fire damage, and that's patently not the case.
'nighttime' does not do 'cold damage', and thus would not slay the mold.
i.e. intense sunlight, like, say, a desert, that deals out environmental fire/heat damage, should make a brown mold simply explode in size. Ergo, there should be no hot deserts...they should be wastelands of brown mold soaking up that sunlight and playing havoc with the environment.
since it is considered normal to find brown mold in patches of 5ft I would guess that is the size it is stable at and above that the cold it generates would eventually kill a portion of it. Say in a couple of hours. This is similar to the toxins released by real world organisms that spread, so you could cover a large area but then the cold it generates would kill most of it off, leaving scattered patches of it.
say you chuck it an volcano the volcano is frozen solid within minutes and most of the mold dies from its own cold damage.
and for all we know surface insects might love brown mold and rip and brown mold at the surface apart.