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[Kumis]

Just wondering if anyone else has encountered this, whether there's a rational reason for it, and if not whether I should report it as a bug.

I started a new fortress, and after only digging a 1 z-level deep ditch I set about setting up my metal industry. Under the furnaces option all the magma furnaces are available. I then set about digging my entrance, and cave moss sprung up.

The thing is, I couldn't see any magma on the map surface, nor any entrance leading down into a cavern. When I check the units screen I don't see any subterranean life, either.

A point to add: this fortress is adjoining another one of mine in which I had not only breached the caverns, but also the magma-seas. I have other fortresses in the region/world that don't exhibit this little phenomenon, it's only this one.

So, sound familiar to anyone?

[Button]

Check the room list. (Shift-R).

If you've got an Upright Spoiler Spoiler too near to a magma pool, that might do it...

[Kumis]

Hm, nothing out of the ordinary there. The buildings I've constructed, my stockpiles and my wagon.

By Upright Spoiler Spoiler I take it you mean from Adventure mode? I've never got that far... I usually get brained by a boar.

[joeclark77]

By Upright Spoiler Spoiler I take it you mean from Adventure mode? I've never got that far... I usually get brained by a boar.

No, it's a spoiler referring to...

Spoiler (click to show/hide)

a Demon Fortress which occasionally is found on your map.  If you see the sword in your Buildings list, I think you can even zoom to it and see where it is.

[Kumis]

Aaah, not got that far in Dwarf Mode, either. I knew there was something down there, but never quite got round to going down there - always felt underprepared.

But yeah, no room in the list, alas.

[Telgin]

I believe this can happen if you've had a previous fort in that world.  Something about the game setting internal flags for discovering the caverns and magma sea that aren't on a per fort basis: once you discover them they're considered discovered for that world.  Or maybe it's per civilization?

[Kumis]

It could be the case that this fortress is from the same civilisation as the last. Though I would like to stress that it's adjoining, it has at least one square in common with the old caverny-breachy one.

I have a bad habit of not keeping track of civilisation or fortress names, so I can't check that right now.

[Drazinononda]

AFAIK any fort breaching the caverns causes underground flora to grow underground on any subsequent fort in that world.

[Kumis]

I don't recall having it in other fortresses in between McBreachy and the current one, though. So maybe it is a civ-based thing.

[Hetairos]

I've heard it works per underground region, but I can't find the source for this.

[Tacomagic]

I've had the opposite happen to me a few times.  Breached the cavern and there was absolutely no plant life, and I didn't get spores to underground loam.

Happened to me a few times on default world gens, not sure what causes it, but it's kind of a world killer as other sites in the same world seem to have the same issue.

[Exitstrategy]

According to what I've read, If you've found a cavern in a previous fort then you can have moss grow in another fort because the cavern connects the two forts. Unfortunately you can't travel to the old fort in Dwarf Mode.

[Kumis]

Well I'm sufficiently close that the my cavern interacts with the old one, so I'm willing to bet that that's it.

Now, any ideas on how we can test that to confirm it? I see two options:
1. I have a look; I take screenshots of the caverns by the map edge in this fort and in the other and compare for shape-matching.
2. I have a look; in adventure mode.

I could try pouring water or something off one end into the other, but I think then that it just gets destroyed.

[Sirbug]

According to what I've read, If you've found a cavern in a previous fort then you can have moss grow in another fort because the cavern connects the two forts. Unfortunately you can't travel to the old fort in Dwarf Mode.

Moss will always grow once you uncovered it in fortress mode. There seems to be one flag "have moss" per world.

[Ionizer]

I've got this too.  My first fort of this newly genned world breached caverns (and succumbed to the terrors fun stuff inside), and my current fortress has cave moss and tower caps and whatnot without breaching the caverns yet.
 
I'm not sure if my old fort is in an adjacent embark zone as my new spontaneous cave flora one is, but it's a distinct possibility (I remember noticing on embark that the regional maps looked similar).  They are also the same civilization, so I'm not sure if it's one variable or the other.