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Yeah. I've had mushrooms pop up in all of my vivariums over the years and I only just started using a pro-plant fungal inoculation recently.![]()
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That last photo is so over-used on our site it's embarrassing. I love it, though.
Dispelling a mushroom myth: A lot of people (not often on Dendroboard) have suggested that bioactive terrarium additives or mushroom spores are necessary (rather than optional) if you'd like to introduce fungi to a terrarium environment. In my experience, plants which were grown in soil rich in beneficial fungi are likely already colonized by arbuscular mycorrhizal fungi. The fungi will be alive inside a plant's cells, and the mycelium (fungal root structure) should be able to spread outward if conditions are conducive, once the plant is re-planted in new substrate. For example, if I propagate a plant which was taken from a fungi-rich organic potting soil, bare root it, and place it into sterile potting media, it's likely that the fungi will also colonize the previously sterile media over time. It's pretty cool.The same theory applies to terrariums and most of the substrates used in the hobby, assuming those substrates play nice with fungi.
Obviously this doesn't apply as much to plants grown without fungi, in fungicide-rich environments, or to inorganic/impermeable terrarium substrates which are not conducive to fungal inoculation.
TLDR: The only thing we added to get the mushrooms shown above were plants which were originally grown in fungi-rich soil. 🍄
They explain it better than I can:
https://www.frontiersin.org/articles/10.3389/fpls.2019.01068/full
https://link.springer.com/chapter/10.1007/978-3-540-70618-2_13
https://turf.umn.edu/news/arbuscular-mycorrhizal-fungi-tiny-friends-big-impact
https://untamedscience.com/biology/ecology/mycorrhizae/
Nice photos btw.