Kiwi has been offering it for a few years. Originally it was listed as 'White caapi' until our buddy Zaka over at the Nook ID'd it, the same way it happened with Alicia.
Whether it really is used as an ayahuasca or not is anybody's guess, it doesn't appear in the ethnobotanical literature at all to my knowledge.
Assuming the seeds you got and the seeds I got are from the same plant (which might not be a valid assumption), they should have high viability, and pop within just a few days. I got 9/9 to germinate a few years ago, but then lost all of them sometime later to lack of water.
I had kept one aside for future ID purposes and decided about a year later to try germinating it. Germinate it did
, and two years later it's still alive.
The species either is very slow to grow or needs lots of root space to stimulate it to grow. Mine is now about 7 or 8 inches high going into it's third year and still in a shallow 5 in pot. It is now for the first time putting out branches and multiple leaf sets at the same time. Prior to this it has always been just one growing tip and one (very slow) set of leaves at a time.
I recommend planting the seeds very shallowly with the wing sticking up. The whole seed coat will split exposing the embryo and the cotyledons. A root then goes down and a shoot comes up and forms a pair of true leaves without the cotyledons ever doing anything but sitting there. Never saw anything like it, but then I'm not an experienced botanist either, just a rabid amateur.
The mature leaves are thick and kinda hard like a holly leaf.
And I think the correct spelling is 'mathiasae'.
That's everything I know about this plant. Will add more later if anything else comes to mind.