Sorry to bump this again. But I just stumbled upon the Matthew Clark Video on the AYA2014 conference, and so got interested.
https://www.youtube.com/watch?v=q0o3t3ZkWgYFirst I really find it fascinating that they mentioned (Atharva Veda) to have 5 special plants, of which Soma was the best.
These were apart from Soma: Bhanga (pot), Yava (barley), Darbha/Kusha-Grass (Desmostachya bipinnata) and Durva-Grass (Cynodon dactylon).
If find this really interesting as 3 of these do not seem to have anything very special to them. Why Barley? Could the Claviceps fungus play a role here? Or was it just because it was important to feed the people?
Also fascinating are the two grasses mentioned. It doesn't seem they contain any psychoactive alkaloids. They seem to be pure herbal medicines.
But I did found, that Durva-Grass also gets sometimes infected with a Claviceps fungus.
Back to Soma. Soma means "pressed juice". One makes a decoction of its juice and drinks it.
I found the following various descriptions, compiled from various sources:
* It is a water plant, or growing near water plant.
("the main Rig Vedic Soma land also refers to a lake and means βabounding with reeds'" and "This again shows Soma growing in marshy or aquatic areas and [perhaps?, IMHO] being some sort of reed." )
* it has a (yellow) milky juice in the stalks, which get mashed by stones, pressed with wood, and filtered over a wool fleece.
* it has uncommon leaves and filaments/fibers.
* It is purgative.
* is described as having leaves that come out in a circular pattern like the Moon.
* growing "joint by joint, knot by knot".
* grows in the mountains (Rig Veda I 10:2), particularly during the rainy season (RV I 13:1).
* described as a stalk (RV I 125:3; Atharva Veda V, 29 & VI, 49) that is brown (RV VIII 29:1) and yellow (RV VIII 9:19 & AV XX,141).
I find it also interesting, that it is said that Soma is existing in all plants (RigVeda X.97.7).
I also believe that it could really have been a mixture. DMT and some MAOI, like Matthew believes could certainly be a possibility. That could also explain the said: it is existing in all plants. Which wouldn't be perfectly true, but is basically about what Shulgin said, it being "everywhere".
I personally really do not believe in the shroom hypothesis, as just no description even remotely reminds of shrooms.
Edit:
What is really strange IMHO is the two totally different effects it seems to have. On one side it seems to be rather a stimulant, you would take before a battle (therefore many think it was ephedra), OTOH it seems to be a psychedelic/entheogen.
IMHO this could mean, that e.g. a low dose has a totally different effect vs high dose, or that really two (or more) totally different plant concoctions were called soma.
Or that different plants in the concoction were used at different ratios.
Also IMHO DMT+MAOI doesn't really seem to me like such a bodily stimulant in low doses. At least not for me. If at all, I could see 5-MeO-DMT a bit in this respect as it gives a nice energy in the body at low doses, without any hallucinogenic effects.
BTW: According to Matthew you had to drink again every 3h. This again could fit the time frame of DMT or 5-MeO-DMT with an MAOI. I would be interested if anywhere is indicated, if this could go on for longer times. If yes, that would mean no tolerance.
OTOH someone pointed out, that we have some indications that soma was creating an addiction, as there is allegedly a ritual in the Yajur Veda (X) called Sautramani to go through for excessive soma drinking.
But if it was a mixture of several plants (e.g. also Ephedra) it could mean only some plants were addicting in it.
Edit2:
Had a short look at the Sautramani ritual. Seems to me like a "normal" alcohol and animal sacrifice lasting 4 days. Doesn't look to me like something to do to get rid of an addiction...only maybe to keep the person away from soma for 4 days...
I claim not that this is the truth. As this is just what got manifested into my mind at the current position in time on this physical plane. So please feel not offended by anything I say.