hey Murphy, does the purpose not depend on our own values that we bring to the analysis of these organisms? Tweak our values of analysis and values of description (norms of analysis/description) and you will change what function the psilocybin has in the mushroom fruiting body.
Purposes are not discovered, they are proposed and then accepted within a scientific community. *)
In particular about the red-coloured part:
No, at least not how I meant my question. What I called "the purpose in nature" is definitively independend from human values. Maybe my choice of words was a bit inaccurate. Just for clarification, let me state it again:
In my thinking (and this idea is directly derived from Darwin's theory of the evolution of living creatures), there is nothing in nature that does not serve a purpose. Well known examples were mentioned here by others, like: Lots of plants produce tasty fruits, so that certain animals get attracted, eat those fruits and propagate the indigestible seed contained within...and so on...
I strongly doubt that humans are by any means involved in the 'purpose' of psilocybine. This has several reasons, which I don't wanna discuss here, because that will only lead the thread astray. Please consider just this one single point; maybe not the most important argument but a very illustrative one IMHO:
Psilocybine-containing mushroom species are spread all over the world, in different climates and on different continents. Most of them grew for quite a long time without getting significantly noticed by human beings, i.e. magic mushrooms were a sacrament only in ancient Central America. If
Homo sapiens was involved somehow in 'the purpose', and therefore, the fate of those species, we wouldn't see them in such diverse places. But actually, we do (e.g.
Psilocybe semilanceata was not consumed intentionally by Europeans until ca. 1950-60, when science discovered its psychoactive nature)
Therefore, I completely reject any explanations that directly involve human beings. That is just a egocentric thinking, like the now fortunately abolished idea that earth must be in the "middle" of the universe (because
we live on it), or that we are the pride of creation (...we are NOT! we are just an ugly disgrace for nature IMO)
But the fact that these mushrooms produce psilocybine now for several thousands of generations (i.e. reproduction cycles), and in addition, that not only one but LOTS of species do so, gives me the confidence that this happens for a reason. The question is now:
Which purpose???
I admit, in really many cases humans have no idea whatsoever about the purpose that some things fulfill in nature. But that is because we do not understand nature thoroughly (and maybe never will), which is absolutely unrelated to my original question.
It is
HIGHLY unlikely that psilocybine is only an evolutionary remnant. Again, I see several reasons here:
- The compound seems to get produced now for several thousands of generations within these fungi, which suggests that it must pose some advantage for the species who do so.
- the compound gets produced by several species, which suggests that it is not just a random mutation that wasn't selected out yet.
- These species are not only native to a certain climate or restricted geographical area but are spread nearly worldwide (sometimes because they were introduced there by us, but definitively not always), which suggests that psilocybine serves a purpose that is independent of a) climate and b) certain animals/plants that do not share this wide distribution. Psilocybine's purpose must be of a more general nature.
- Very closely related compounds (like DMT or bufotenin) are produced by completely unrelated species (toads, plants...); that
could be an example for
parallel evolution (maybe). Let me quote the first line of the resp. Wiki-article:
Parallel evolution is the independent evolution of similar traits, starting from a similar ancestral condition due to similar environments or other evolutionary pressures
THAT is what I'm inquiring in this thread: WHAT kind of evolutionary pressure is it that makes the production of psilocybine feasible?
The once discussed idea of psilocybine as an UV-protector seems a bit unlikely now to me, after having talked about it with others in a different forum. Maybe it is "simply" a repellent against certain feeding predators? Maybe it serves as an antioxidant? Maybe something totally unrelated...

Possibilities are numerous.
I'd love to read some more theories, which are backed up
with facts.
*) Well, this may be just some confusion due to my choice of words. Your description is indeed valid for
all science: Things get observed, then somebody states a theory about it. Then it gets discussed and finally accepted, if all evidence speaks for the proposal and nothing against it. When new evidence is found, the proposal must be re-thought.
The theory of psilocybine as some kind of symbiotic factor for humans was
rejected for this reason.
Your,
Murphy Clox