I've tried them truffles in the past and while the vendor website advertises that 15g will make one understand rocket science, I get interesting experiences on that dose range but can still move around and would be able to maintain a conversation if needed, altough it would be quite obvious that I'm tripping .

At 24grs I start to see some wiggling and LSD-like tracers and things get a bit weirder but I'm still able to direct the trip.

But that's me & I'm thinking that maybe I need higher doses than normal and so I would like opinions about a good dosage of P. Atlantis sclerotia for someone who's only had one low-dose psychedelic (LSD) experience so far. I don't want my friend to be too far gone, as the idea is just enjoying nature in that special state. Maybe something like 10gr instead?

I certainly would not give more than 10 g of atlantis to a beginner, but that depends on how he responds to mushies (bodyload and such). My first time dosing atlantis truffles I took 8 g and it was a pleasant, moderate experience, although a little sedating after the three first hours of high and acute perception.