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0011303Dwarf FortressDwarf Mode -- Environmentpublic2020-02-04 01:492020-02-16 09:18
needs feedbackopen 
PCWindows 10
0011303: Cave moss not appearing in cavern layers
I've been attempting to make a series of cavern-locked dwarvws with grazers but I've actually been unable to get cave grass to spawn at all.
1) Generate a world
2) Dig to the first cavern layer
3) Witness the lack of moss.
I've made some init changes regarding the fps counter, spacing, and other minor gameplay tweaks but nothing was related to plants
No tags attached.
related to 0011377acknowledged Loci Breached mossy cavern did not release cave spores 
Issue History
2020-02-04 01:49DragonslayerelfNew Issue
2020-02-04 02:29FantasticDorfNote Added: 0039853
2020-02-04 03:58TalvienoNote Added: 0039855
2020-02-04 06:56TalvienoNote Deleted: 0039855
2020-02-04 11:53mrmagolorNote Added: 0039863
2020-02-04 12:15LociNote Added: 0039866
2020-02-04 12:15LociAssigned To => Loci
2020-02-04 12:15LociStatusnew => needs feedback
2020-02-14 18:16anewanameNote Added: 0040059
2020-02-16 09:17LociIssue cloned0011377
2020-02-16 09:17LociRelationship addedrelated to 0011377
2020-02-16 09:18LociNote Added: 0040080

2020-02-04 02:29   
Cavern moss can spawn on dirt stairs once the caverns are revealed but won't spontaneously or noticably spread to appropriate sun-hidden soil tiles from what i've seen anecdotally on a few worlds for 47.01.

Some saves provided in notes uploaded to DFFD would help clarify, i will attach one when i have the appropriate means to but it seemingly happens on every embark attempt reliably enough to reproduce.
2020-02-04 11:53   
Some caverns are dry at random. Are there any mushroom "trees" in the cavern? If not, this is likely the cause.
2020-02-04 12:15   
Nearly all underground plants (including cave moss) require a "wet" biome. If you "tweaked" the caverns to be "dry" then a lack of plant life is expected. Even if you didn't, subterranean chasm caverns will occasionally spawn. How many caverns did you actually check?

I checked a few caverns in v0.47.01: three had moss, one did not. Those with moss released "spores" and spread vegetation to other underground tiles as expected.
2020-02-14 18:16   
Here is an example from this thread...
http://www.bay12forums.com/smf/index.php?topic=175575.0 [^] ,
the save...
http://dffd.bay12games.com/file.php?id=14792 [^]

You can see that the player breached a mossy cavern on z66, and built a wall in the tile adjacent to moss. But spores will not spread until another mossy cavern is breached, on z13, about 20 tiles to the northwest of the central staircase.
2020-02-16 09:18   
Split the malfunctioning spores to 0011377