The Tryptophan/Tryptamine content of the substrate could vary too. But Tryptophan and/or Tryptamine
must be present in substrates or mushrooms could never make psilocin.
After the initial absorption of Tryptamine and/or absorption & decarboxylation of Tryptophan
the following enzymatic Methylation, Hydroxylation & Phosphorylation -steps might not follow
1 fixed order as this article suggests: http://countyourculture.com/2011/12/05/grid-biosynthesis-psilocybin/
It would also account for the presence of Baeocystin & Norbaeocystin in Mushrooms.
As to why DMT & NMT have never been found in mushrooms; Could be that DMT & NMT
are metabolised too quickly, too constantly to ever be present in detectable amounts.
Has anyone here ever done a chemical analysis of the content of Psilocybin Mushrooms?
I understand some Nexians have access to Gas chromatograph collumns and other analysing
tools. Who knows; You just may find DMT and NMT afterall, if only in tiny trace amounts.